Which will be bigger Gow 2 or Halo 3?

Me and my frind have been fighting over which one will be bigger gears of war 2 0r halo 3. I myself like halo so i am going for halo 3 but he likes gears. This needs to be setteled people tell me your takes on this.

or

halo is going to sell more copies but GoW will be a better game.callen3

and how do you know this?

Exactly, why speculate on a game thats not coming out for a few years, or compare games that are that far apart in terms of release date?jacksheets