I honestly would stick with mw3. Reasons being I like the guns, kill streaks (mainly specialist), and some other smaller detail. The zombies in bo2 is no big deal to me and online on both xbox (own a copy) and pc (tried it on a friends pc) is not to much fun. But since everyone has a different opinion , rent it or borrow it from a buddy to see if you like it. I gave my copy to my brother and rarely play it.