You do realize that the Playstation 3 far outclasses the 360 in terms of raw hardware power? I love my 360, but it's pretty obvious that it's an outdated system, even with the recent design update. Sony's machine has been less popular because it a) had a late (and disastrous) start, and b) because all the good exclusive titles (such as Halo) were on the 360. Now, as developers begin to realize the potential of the PS3, the shift to the other console is slowly beginning, as Sony offers a more attractive and profitable deal for developers in the long run.
That's my take on it anyway.