"There's some splendor, but a whole lot of warfare in the grass, in A Bug's Life, the latest computer-generated insect film of the year. Did I ever think I'd ever say that sentence? And who ever thought we'd get two in one year?"This page is a list of similar works made during the same period of time. Sometimes one work intentionally copied another. Sometimes it's part of a wider trend in which that type of work became very popular all of sudden and others are made. Sometimes it's total coincidence: the creators just had the same idea. Which is the original and which is the imitation is not always completely clear; sometimes, however, it is painfully so. Sometimes, rather than home-brew a knock off, a company will license a foreign work, and adapt it to be more like its competitor. Occasionally, creators will be forced to war with one another when they simultaneously produce similar works which are subsequently released within a short time from each other. One thing to remember regarding Dueling Works is that Tropes Are Not Bad — while many Dueling Works appear to be blatant rip-offs, the competition between two shows (or simply the desire to set each other apart) often spurs each other to develop in quality. The result is a grateful television audience. See also Dueling Products for proof that this type of competition isn't limited to just works. See also The Mockbuster. Not to be confused with Dueling-Stars Movie. Again, just to be clear: The works have to be produced during the same time period, otherwise you've got either Follow the Leader or Serial Numbers Filed Off. Also see Fandom Rivalry.
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- One happening within Marvel's own works between All-New Wolverine and the 2015 Old Man Logan over which is the "rightful successor" to previous Logan-led Wolverine books. Points in All-New Wolverine's favor is the title, and the fact that Laura is actively using the Wolverine name and is marketed as Wolverine by Marvel. However a segment of the fanbase considers Old Man Logan the "real" Wolverine book since it stars a Logan, while citing its much more violent content.
- DC's Doom Patrol and Marvel's X-Men. Both teams consisted of super-powered individuals shunned by the world, were led by a man in a wheelchair, and premiered within months of each other in 1963.
- DC's Who's Who and Marvel's Official Handbook of the Marvel Universe have competed with each other a number of times. During the original run of Who's Who in the mid-1980s, Marvel released the second volume of OHOTMU (also known as the Deluxe Edition). After releasing updates for Who's Who in 1987 and 1988, OHOTMU received an update in 1989 (that same year, DC included Who's Who entries in a number of their annuals). When DC revamped Who's Who in 1990 as a customizable loose-leaf edition, OHOTMU followed suit with their loose-leaf Master Edition before the end of the year.
- DC's Swamp Thing and Marvel's Man-Thing premiered around the same time in 1971. When Swamp Thing received his own series in 1972, his origin was changed and became much more similar to Man-Thing's, who also received an ongoing feature in Adventure into Fear at the same time.
- DC's Superman and Fawcett's Captain Marvel, so much so that when Captain Marvel's books sold better than Superman's, DC sued Fawcett over similarities between the characters. DC would eventually buy the rights to Captain Marvel from Fawcett.
- Halestorm and The Pretty Reckless, both being 2010s Hard Rock bands with female lead vocalists, get compared a lot, e.g. this video. The two groups toured together for a month in 2015 and from the sound of it their respective frontwomen Lzzy Hale and Taylor Momsen actually get along pretty well.
- Kanye West's 808s & Heartbreak and 50 Cent's Curtis were both released on the same day, September 11, 2007. Naturally, the battle between them was heavily hyped up in the music press, with Kanye and Fiddy regularly taunting and dissing one another in the lead-ups to the release of both albums. Of particular focus was that it was a clash between two different styles of Hip-Hop — 50 Cent was an icon of early '00s Glam Rap, while Kanye was known for more personal lyrics that spurned the influence of Gangsta Rap. The decisive victory of 808s & Heartbreak not only put 50 Cent's career on the skids, it is often regarded as the tipping point in the decline of glam rap as a whole.
- Whenever an artist releases multiple albums on the same day, there can be a competition to see which one will sell the most copies (examples: Guns N' Roses' Use Your Illusion I and II, Bruce Springsteen's Human Touch and Lucky Town, and the solo albums of all four KISS members).
- The classic example for this trope in music would be The Beatles and The Rolling Stones.