Ajax on 12 February 2008
this might be the reason:
the ps3 library is significantly smaller than that of the 360
so it's new or good or famous games have less competition
than games or multiplatform games on the 360
a 360 gamer has more to choose out
so there is a good chance that the 360 had a much more similar attach rate to the ps3 a year ago then it has now with the 360
''Hadouken!''