I would say AC. I have both, and i have enjoyed AC MUCH more than cod4 so far. Although i can see AC getting repetive, all in all, i have found it just a lot more fun than cod. Cod4 is a standard shooter, very well done but many have come before and many more will come after (endwar, frontlines, R6V2), i would say go with AC, its kinda a unique game and great experience.SteelWingKnight

go with cod4.....and btw ..endwar is gonna be a strategy game..not a fps....