pretending I have a PS3 and 360, I would get the 360 version because of the more content, but I would still consider the PS3 version because I would be more used to the controls.
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut