Favorite of Marvel: Spiderman, cuz he is freaking awesome, I love the dicotomy between Peter Parkers personality and Spiderman's, because he has a bitter life but he always has a good joke to say, and because is a better version of Batman (Batman lost his parents and he lost his head for revenge, Peter lost his uncle Ben, and now he try to be a better man. Now, who is the kid?)
Favorite of DC: Sandman, I know that he is not a super hero (technically), but he is freaking awesome, and the entire universe made by Gaiman is fucking awesome to.
Favorite of Dark Horse: Hellboy, because Mignola is a freaking awesome artist.
Less favorite of Marvel: Squirl Girl.
Less favorite of DC: Silver Age Superman.