Photos: Merida from 'Brave' – It's not hard to find cosplayers dressed as the same characters at conventions like San Diego Comic-Con. But we're wondering: Who wore it best? Merida, the popular character with long red hair from the Disney-Pixar movie "Brave," made a splash at Comic-Con 2012 when the movie was released, as seen in both these photos. Hide Caption 1 of 11

Photos: Klingons – "Star Trek's" Klingons, of course, are a perennial favorite for cosplayers at any fan convention. Check out these two from Comic-Con 2010 and weigh in on your favorite below. Hide Caption 2 of 11

Photos: Batgirl – Batgirl's costume continues to inspire cosplayers (and look for takes on her new costume this year). Which version is your favorite? Hide Caption 3 of 11

Photos: Iron Man – The takes on Iron Man can vary: Some like to leave the mask off and go the full Robert Downey Jr. route, but others like a more classic look. Which do you prefer? Tell us below. Hide Caption 4 of 11

Photos: The Joker – Two very different Jokers - one looking like Jack Nicholson, the other like Heath Ledger - from Comic-Con 2010. Choose your favorite below. Hide Caption 5 of 11

Photos: Black Widow – Black Widow has grown in popularity since her appearances in Marvel movies like "The Avengers." Here we have two from 2010. Which was best? Let us know below. Hide Caption 6 of 11

Photos: The evil queen from 'Snow White' – The poison apple is a must if you are cosplaying as the evil queen from "Snow White and the Seven Dwarfs." Which of these is your favorite from 2012? Hide Caption 7 of 11

Photos: Wonder Woman – Wonder Woman will never lose her popularity in cosplay circles. Here's one accompanied by Green Arrow in 2012, and another from the same year. Hide Caption 8 of 11

Photos: Poison Ivy – Poison Ivy is one of Batman's most dangerous foes. Here are two interpretations of her character from 2010 and 2014. Hide Caption 9 of 11

Photos: San Diego Comic-Con cosplay: Who wore it best? – Elsa from the wildly popular Disney movie "Frozen" is certainly a hot costume this year. Hide Caption 10 of 11