I'm kinda torn on this question.
On one hand, I knew Marvel more than I knew DC back when I was younger. My favorites have always been Iron Man, Spiderman (Then again, who hasn't loved spiderman xD), Thor, X-Men, and not to mention they have the Avengers.
DC, though, has Batman, Joker, and Superman.
I think in all I've gotta go with Marvel. But DC is still amazing