The male choices in female-centered love triangle usually comes with two archetypes: the kind-hearted, safe Gentleman and the edgy, dangerous Scoundrel. The Gentleman is a good guy: honest, upright, and noble. The Scoundrel is an outsider to the heroine's world (most of the time), dangerous and wild. It is a love triangle between a heroine and Noble Male, Roguish Male: a man who is safe versus a man who is dangerous.
The Gentleman is likely someone the heroine has known previously, the kind of man who represents the safety of her youth and home. The Scoundrel has a dangerous spark that attracts her into his world. That kind of danger is usually emotional in nature—the heroine risks a wild and unstable relationship with him, especially in contrast to the relative dependability of the Gentleman. Parents will favor the Gentleman and discourage dalliance with the Scoundrel, regardless of personality.
A discretional angle features the heroine committing to a lifestyle via a man: choosing traditionalism vs passion or lasting happiness vs transient excitement. In these cases, one of the two men will almost always have a clearly undesirable personality. If the poorer character seems to fit the patterns of Gentleman better (and vice versa), the trope is instead Rich Suitor, Poor Suitor.
Unlike with Betty and Veronica, the heroine often chooses early or midway into the story, and who she ends up with is usually dependent on the length of the work and how early she made a choice. If a choice is made very early, the heroine is more likely to end up with with that first choice after agonizing UST and Will They or Won't They? with the other man. If the choice is made mid-way, then it was the Wrong Guy First.
Bear in mind that not every love triangle with two men is going to fit.
Spear Counterpart to Betty and Veronica. Compare Noble Male, Roguish Male, All Girls Want Bad Boys and Single Woman Seeks Good Man. See Rich Suitor, Poor Suitor.
Anime and Mange
In Naruto, there's Sakura who seems to be choosing between Naruto (the Gentleman) and Sasuke (the Scoundrel).
Gakuen Alice: Mikan has Ruka (the Gentleman) and Natsume (the Scoundrel).
Shugo Chara!: Amu has Tadase (the Gentleman) and Ikuto (the Scoundrel).
Fruits Basket: Tohru has Yuki, a stoic princely type who is always polite to Tohru, and Kyo, a hotblooded delinquent who tends to insult Tohru. She only meets Yuki a short time before Kyo.
Cardcaptor Sakura: Sakura has Yukito (the Gentleman) and Syaoran (the Scoundrel). Played with in the end: Yukito ended up with Sakura's brother, and by the time Sakura fell for Syaoran, he was far more of a Gentleman than a Bad Boy.
In the anime, Syaoran has Sakura (Gentleman) and Meiling (Scoundrel). Again, Sakura and Syaoran get together, and shortly before that Meiling says "I Want My Beloved to Be Happy!".
Vampire Knight: Yuuki has Kaname (the Gentleman) and Zero (the Scoundrel). However, the roles could potentially be switched. Zero is her "safe, comfortable friend", while Kaname is the exotic one that she believes she literally can't have.
Prétear seems to set this up between Himeno, Sasame (a good listener, explains things to Himeno) and Hayate (troubled, acts like a jerk who wants nothing to do with Himeno), especially in the manga. The anime is more... complicated. Note that she meets them both at the same time, and that in the manga they are presented as equal candidates. In the anime, well. Again, it's complicated.
In Peach Girl, Momo spent years with a crush on the chivalrous and polite Toji, until she finally gets him. They guy helping her out on the way is Kairi, a lecherous, school-skipping bad boy she discovers she now has feelings for. Throughout the series she bounces back and forth between them, until finally she ends up with Kairi.
Princess Tutu plays with this trope in a way that approaches Cyclical Trope levels. First, we have Fakir (the Tsundere Scoundrel) and Mytho (the Gentleman) for Ahiru. However , their roles are subverted in the second season with Fakir as the the Gentleman to the Raven Prince Mytho's Scoundrel. On the other hand, while Ahiru seems The Betty to Rue's Veronica... Rue's certainly The Betty to Princess Tutu's Veronica for Mytho. And if we bring Princess Kraehe in this, this starts all over again. Plus, Autor could be the Gentleman for Rue while Mytho is the Scoundrel.
The one-episode Love Triangle from Kaleido Star had Sarah choosing between Kalos as the Gentleman, and Andy as the Scoundrel. Sarah chooses Kalos — in fact, she had chosen him quite a while before and that's why she had stayed in the Stage in the first place. Andy never really stood a chance, and he immediately acknowledges it.
Another genderflipped example: In Eden of the East, Osugi (Betty) and Takizawa (Scoundrel) to Saki's Archie.
One example was a long-running Love Triangle with Jean Grey, Cyclops (the Gentleman), and Wolverine (the Scoundrel). Cyclops was the square-jawed, righteous leader of the team who had been with Jean since the beginning. Wolverine was the short, hairy Anti-Hero who had a smoking, drinking, and killing problem.
Another example was the love triangle between Havok, Polaris, and Iceman with Havok as the Scoundrel and Iceman as the Gentleman. Havok and Polaris have been through hell and back together since the earliest days of the comic.
For a brief time, Rogue, she had the polite and sincere Magneto clone, Joseph, as the Gentleman and the dangerous charming thief Gambit as the Scoundrel. Eventually, she then she has Gambit as the Gentleman, who was the traditional choice that had a lasting love for her, and Magneto, the Scoundrel, former super villain.
In Pirates of the Caribbean with Jack as the Scoundrel and Will as the Gentleman. Elizabeth must choose between them. As if often the case, since Will was chosen early, she ends up with him after some amount of flirtation with Jack.
Star Wars. With Princess Leia Organa has a brief love triangle with good-hearted, loyal, and friendly farmboy/Jedi Luke Skywalker is the Gentleman. Roguish, rough, and experienced Han Solo is the Scoundrel. Rather luckily (given the later revelation that she was Luke's Long Lost Sibling), she chose Han.
Subverted in Not Another Teen Movie, where Janey, having to choose between Jake (The Jock who dates her only because of a bet with his Jerk Jock buddy) and Ricky (the annoying, whiny loser of a "friend"), chooses the former, causing him to have a change of heart, while the latter remains an annoying whiny loser.
Bram Stokers Dracula has (although Bram Stoker's Dracula does not) a version with Mina chooses between Dracula as the Scoundrel and her much more average fiance Jonathan as the Gentleman. Dracula dies, but it is not made entirely certain that Mina goes back to Jonathan.
The 2010 Rupert Grint movie Cherrybomb, with Michelle having to choose between the (relatively) safe and dependable Malachy (Gentleman) and the rebellious, dashing Luke (Scoundrel).
In The Notebook Allie has to choose between Lon Hammond Jr., a dashing young lawyer who is funny, charming, sophisticated, and comes from old Southern Money or the local country boy Noah Calhoun who threatens to jump off of the Ferris wheel if she doesn't go on a date with him and constantly fights fights with her.
This is a common theme throughout the novels of Jane Austen, of the heroine being torn between a dependable, caring man and a libertinish cad. She will always choose the former, but Austen will keep you guessing as to who it is.
Sense and Sensibility: With Marianne choosing between Brandon the Gentleman and Willoughby, the Scoundrel.
Mansfield Park: With Fanny, Edmund is the Gentleman and Henry is the Scoundrel.
Emma: With Emma, George Knightley is the Gentleman and Frank Churchill is the Scoundrel.
In Harry Potter, the trope is played with in the Lily/Snape/James triangle. From Snape's perspective, he was always the Gentleman: the childhood friend who dearly loved the gentle Lily despite of her heritage, and James was the Scoundrel, an arrogant bully only interested in Lily for her looks. While Lily sees James this way at first, his treatment of her personally and Snape's treatment eventually ends up with James as the Gentleman, and Snape as the Scoundrel.
In Stephanie Meyer's Twilight saga, Edward is the Scoundrel, and Jacob is the Gentleman. While Jacob is more forceful and direct than the well-mannered Edward, Edward's life invited danger and death into her life, and was the choice her parents couldn't stand, while Jacob is the old friend boy-next-door who dependably offers Bella emotional support.
Bridget Jones's Diary plays this fairly straight between Mark Darcy (Gentleman) and Daniel Cleaver (Scoundrel). The film version even describes them as "too good to be true" and "so wrong he might just be right", respectively. By the end of the books, Mark has won, although when Helen Fielding continued the column, apparently Bridget was still torn between them and even ends up having Daniel's baby. Sigh.
In the Stephanie Plum series, the protagonist of the same name is caught in a love triangle between her childhood friend Joe Morelli and the more mysterious Ranger.
In The Hunger Games, Katniss' original choice was not between a Gentleman and a Scoundrel, as they were both dependable people. However, as the series progresses, Peeta reveals himself as the Gentleman who cares deeply for Katniss and desires her safety, and Gale the Scoundrel revolutionist who desires to entangle Katniss in that world.
Wuthering Heights has this as a central theme. Catherine must decide between Heathcliff and Edgar Linton- one a childhood friend with whom she shares a relationship approaching siblinghood, the other the eldest son of a neighboring wealthy family. While Catherine repeatedly asserts that she and Heathcliff are one, her family believes marrying Linton will bring them more prestige, and this is her ultimate choice. However, it is arguable that this decision ultimately kills her, as after a prolonged separation from Heathcliff, seeing him again throws her into a fatal coma presumably from sheer excitement.
Early seasons also have Buffy's friend Xander as the Gentleman and the vampire Angel as the Scoundrel.
While both relatively dangerous, Angel is the original man who ultimately tries to do good and be a good choice for Buffy, and Spike is the dangerous and deadly killer who was fairly remorseless through most of the series.
Angel example: Fred had to choose between the tough, street-smart former gang leader Gunn (Scoundrel) and the bookish, nerdy Smart Guy Wes (Gentleman). (Ironically in Season 5 these roles are reversed, due to Wesley talking a level in badass and Gunn getting a brain implant). Eventually, she chose her Scoundrel, then broke up with him, turned to her Gentleman, died, became an ancient goddess, nearly killed both of them (one inadvertently), then Wes died. Long story.
In Veronica Mars, there's several instances of this throughout the entire series. Duncan, the Gentleman, and Logan, the Scoundrel. Piz (Gentleman)-Veronica-Logan (Scoundrel).
Doctor Who has (or had) Amy between childhood friend and eternally devoted Rory (Gentleman) and the adventurous Doctor (Scoundrel).
From LOST, Kate must choose between noble doctor Jack, the Gentleman, and Southern con-artist Sawyer, as the Scoundrel.
The Phantom of the Opera has Christine choose between her childhood sweetheart and general Knight in Shining Armor Raoul and the insane, brooding but more passionate Phantom. Subverted, as although Word Of God says that Christine loves The Phantom the most, in the end she chooses the Safe Option, Raoul.
Romeo and Juliet - Juliet's decision between her two suitors. Paris courts her in the 'proper' way, by asking her father's permission. Romeo falls in love with her, marries her in secret and even kills a beloved family member.
BioWare is particularly fond of this trope whenever a female has more than one love interest:
In Dragon Age: Origins, Alistair is the sweethearted, noble Gentleman and Zevran the sex-crazy assassin Scoundrel.
In Mass Effect 2: Garrus and Jacob are both steady, reliable people (and Garrus is an old friend), while Thane is a dark, mysterious, broody assassin.
In Dragon Age II, Anders and Fenris are both broody, mysterious, and lead dangerous lives, while Sebastian is a chaste Chantry boy.
In Penny and Aggie. Although Penny has dated both Badass Biker Rich and Nice Guy Duane, she finds that she genuinely loves only the former. Thus, when one of her hypothetical future selves urges her to use "common sense" in deciding whether to run away with Rich, this is her sarcastic response:
Ooh, what if he doesn't make six figures? Ooh, what if I want kids and he doesn't? Whiiiine I better hook up with the nice class president!
Disney's Pocahontas presents a lifestyle choice with the steady home-building Kocuom, choice of her father, as the Gentleman, and the Native killing foreigner John Smith as the Scoundrel. She does not end up with either, as Kocoum dies and John Smith must go back to England, but her choice lies with John.
In King of the Hill, Nancy Hicks-Gribble has been carrying on an affair with the Scoundrel, John Redcorn, while married to her Crazy Survivalist husband Dale (the Gentleman).
In ThunderCats (2011): Lion-O (Gentleman) has a crush on Cheetara which makes Tygra (Scoundrel) jealous. She choses Tygra.
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You are saying that you think this draft is ready to be published. That means the description is not ambiguous,
it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
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