They are both good systems. How ever I think Ill go for the xbox
Reason 1) Amount of games available
2 ) The game pad design
3) xbox live support
4) Windows media player support
end of the day its a microsoft product its easy to link the xbox 360 with other environments like to share your videos, pics, songs.
I am not saying PS3 is bad it is a good gaming system but its personal preferance