If its between Marvel and DC, then I definately read Marvel more. Why? To me, its a little more based in reality. Sure you have your superheroes and super-villians but within the Marvel universe, the lines become blurred more than once. Most of the heroes are incredibly flawed in some fashion and I think thats what helps us relate to them more than say Superman. Batman definately has some major flaws to him, but he's the exception when it comes to the heavy hitters of the DC universe.
However...if you are asking who my favoritre publisher is amonst the choices above...well then it'd be a hard tie between Marvel or Image Comics. Seriously, Marvel has really done a good job for the past 3 years it seems. Whether you loved it or hated it, Civil War was an insane success, followed by Captain America's shocking and realistic death, followed by the less popular but still fun World War Hulk, followed by the successful but totally douchebag moment called Spider-Man: One More Day, and now Secret Invasion which poses to become more successful than Civil War. And this coupled with some awesome new series like Kick Ass and 1985 (which I just read today and just loved). Honestly, DC can't touch that.
But then we have Image. The company I would love to submit my comic to when I'm done with it. Why? Well for one, they don't take ownership of the comics away from their writers and for the most part, the writers are free to do what they want with their work. Prime example of this? Robert fuckin' Kirkman. This man has made one brilliant comic after another for Image...seriously, I'd could speak thousands of words of praise I feel for this man...but I already made a thread for that.

As far as original content, Image definately takes the cake.
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