They're both massive. Halo gets released more often, so I guess they would have the unit advantage. They're both always in the 8-14 million range I'm guessing. Halo's bigger in the U.S., but GT is pretty serious business in EU. I feel like GT is more of an event when it releases since Halo releases more often. They even decided to announce the new one on the week leading up to the MS conference, pretty funny.








