Ail on 22 December 2009
The userbase argument alone doesn't explain the difference.
MW2 has a 2:1 ratio comparing 360 and PS3 in NA and the ratio for Borderlands is 3:1.
I think Uncharted 2 did have some effect as it was released close to Borderlands.
Same thing with Demon Souls...
PS3-Xbox360 gap : 1.5 millions and going up in PS3 favor !
PS3-Wii gap : 20 millions and going down !
