As a comic book fan, this is going to be tricky. I actually enjoy both the big two, when I was young I enjoy listening/reading comic book stories about Superman (the day he went crazy, he died, etc.) and Batman (bane broke his back, some robin sidekicks dies), and at the same time I used to watch the X-Men and Spiderman animated series.
The only differences I could point out is mainly how they build up story arcs to one another, without hating a specific hero/character. Its for the casual to be like that. But I don't know, and I don't care. Comics is good for the read.
As for the Poll, I chose to pick Marvel its because I'm currently in volume in one of their timelines as of now, I still don't have a copy of the current DC comics or probably will just stick with the vintages.