I'd go for the 360 mate. I don't own either but I have played both extensively and I've found that the wii gets quite boring after a while. It's novelty you pay for and game developers obviously put a lot in to ensuring the motion sensor works relatively well with the dynamics of the game but, as Don't(Lie_to_me) said, the graphics suffer as a result and no matter how much attention they pay to the motion sensing facility, it will never be as diverse as the amount of actions and functions you can get out of a control pad.