I've had and played on pretty much every console under the sun ( apart from PS Vita ) and Xbox vs PS3 is invalid because they are competing with each other trying to be like each other, I only got an Xbox so I can play Halo 2 originally. And I found the user interface easy to use and love the pads ( gotta love the pads )
Graphically to me they are both about the same
I am to have as many consoles as I can so I have a greater diversity of games. But lately haven't been interested in Xbox and PS3 been gaming on my iPad most of the time.