These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
To elaborate, here's a small comparison between their introductory lines. From the game:
Camus: My name is Camus O. Laphroaig. Such a beautiful name. Isn't it just like an elegant wind blowing through space?
Milfeulle: Doesn't wind not blow in space?
From the manga:
Camus: We are the Hell Hounds. Today we only stopped by to say hello. But eventually...we shall escort you to Hell.
Crowning Moment of Heartwarming: So, SO many; although the one that takes the cake happens in the first game if you take the time to learn about Shiva during the Dating Sim segments. We learn that Shiva is a girl born of a one-night-stand between the former emperor and MacGuffin Girl Shatyarn. The ensuing scene where mother and child are able to address each other as such for the first time and share a tearful embrace brought tears to troper's eyes.
Les Yay: Due to Ranpha's Re-enact Romantic Moments plan to help Chitose and her condition, she essentially strong-arms Forte to act out the male part. There's an event CG just for this, showing just before Forte and Ranpha kisses. Tact stops them just before the act, and while Ranpha (romantic as she is), protests Tact's interruption, Forte is visibly Squicked by what she had to do.
Most Wonderful Sound: That sound when Mint's ears perk up sends some Tropers into paroxysms of delight.
The Angels' voices, all of them. Milfeulle sounds like a cute girl you might meet next door, Ranpha manages to pull of the impossible combination of "adorable" and "sexy," Mint's calm and graceful voice is soothing to hear, Forte sounds wise even when she's not being serious, Vanilla's soft and whispery voice earned her a lot of fans, and Chitose sounds as pleasant as you can expect from a Yamato Nadeshiko. This troper got introduced to the Galaxy Angel trilogy with Eternal Lovers first, before any translations happened. He didn't understand a word of what they were saying, but completed all the Angels' routes just to listen to those heart-melting, wonderful voices.
Also in the games: there are escalating "harp pluck" sounds when you raise a particular Angel's affection. The "full scale" version when you get a big affection boost will make you fist-pump every time.