I'm not a fan of genderswap because I like the characters the way they are, but if I do read it I want both to be swapped. I read mostly Teen Wolf fic these days and there are so many where Stiles is swapped. The tag will be 'alwaysagirl!Stiles' or 'cisgirl!Stiles'. I think I've come across maybe two fics where Derek was the one swapped and only one where both were swapped.