I'm going to pick GoW because it finally brought something new to the shooter. Halo was good, but not great. Halo was one of the first shooters that had a really good control scheme for the console and played well on the console, but having played numerous shooter on the PC prior to Halo's release, I was not all that impressed with the gameplay. GoW had added something that has been needed for a long time and that is the use of cover. I'm hoping that GoW marks the end of bunny hopping and circle-strafing.