PS3 for the same reason as above poster. Also, motion sensing is coming to both consoles... But i prefer PS3 over Xbox because of the PS3 only games, which in most cases are great.
The only reason people think that the Xbox 360 has better online is because of the already large (larger than PS3) community. PS3 does have the higher capabilities of the two with better graphics, cooling, and already built in features. The Xbox also has a one in six chance of giving you the RROD but it is your choice. Greatness or temporary working crap.