As I said in a previous post. PS3 and 360 exclusives sell roughly the same
X360 - Halo
PS3 - Gran Turismo
X360 - Gears of War
PS3 - Metal Gear Solid
X360 - Forza Motorsport
PS3 - Uncharted
PS3 - LittleBigPlanet
PS3 - God of War
X360 - Fable
X360 - Lef4 4 Dead
PS3 - Killzone
Neither holds a tremendous advantage