Became a modern comics fan in the 60s, the "Golden Age" of Marvel. At the time, DC had been too childish and Marvel introduced more adult and personal themes. The artwork (Kirby and others) was also more inventive and had better style.
It's been a long time since I've bought a comic however. I've become a fan of graphic novels.
Let's understand, I'm approaching comics as an adult. I was a big underground "comix" fan and have a superb collection of first editions of many iconic issues, Zap #0, Zap #1, and so on.
But during the 60s and 70s, I really enjoyed Marvel ahead of DC. I was however a lifelong Batman fan but DC made the subject too juvenile and silly. It wasn't till I found "The Dark Knight Returns" by Frank Miller, the great revival of Batman, that I fell in love again. And later, DC has improved.
Incidentally, regarding Marvel comics, I have a copy of "Amazing Fantasy #15" -- ha!
"Ineluctable modality of the visible..."