I am a DC man, but as anyone who has seen my pull list knows, I am not exclusive.
I dig DC for many reasons... Batman is an important one. But even more so, it is the shared Universe, while both companies have their fair share of continuity problems, DC feels like everything happens together and effects every thing else. What effect is Secret Invasion having on the X-Men? Plus the DC universe seems to be a darker more adult place and I dig that as well.
Don't get me wrong though, I feel that Marvel is the best it has ever been right now. There have never been as many Marvel titles that I was interested in as right now.
Pull list: Afterlife with Archie, Bodies, Chilling Adventures of Sabrina, Coffin Hill, Dead Boy Detectives, The Fade Out, The Goon, Harley Quinn, Hinterkind, Iron Fist: The Living Weapon,The Maxx Maximized, Miracleman, Ms. Marvel, Multiversity, Rasputin, Rocket Raccoon, Sandman: Overture, Silver Surfer, The Walking Dead, Wonder Woman