They're both ****ing terrible. Play a real FPS like say Battlefield 2 and not the shitty console spin-offs.
In COD4 any match with more than 10 people is some warped up shitty version of Quake instagibs with all players using no skill and just firing like crazy. Unfortunately the bad balancing of weapons in the game allows the morons to get away with this.
Halo 3? Ugh, don't remind me of that abortion to FPS>





