The predator covers look cooler and more dynamic than the alien ones.
Overall I'm not particularly thrilled, I never got into caped crusader super heroes, most of my nerd crap is horror, sci-fi and D&D type stuff, although I did really like Batman vs. Predator and even Aliens/Vampirilla.
I think it's a matter of taste, but I'd like to think marvel is putting a lot of energy into killer storylines.