The actual hardware in the Xbox hasn't changed that much at all, asides from offering the machines with bigger memories, hard drives essentially. The graphics processor has remained the same since release. I do think that Europeans think the PS3 is superior to the 360 and North Americans are the other way around. I'm pretty sure you'll find one million dickheads over here that will tell you the 360 version is vastly superior to the PS3.
I mean either way, I don't think you can go wrong with either the PS3 or 360 version of the game, but since I have a brother who works for Microsoft, I need to go one way over the other.