I'll play something in 720 or 900p all day for the convenience that my xbox brings me. Its not even a contest, if I was really that concerned about p's and framerates I'd play just about every multi plat game on PC. Walking into the room saying xbox on, watch tv or go to whatever app with out having to pick up a controller or remote is amazing. Turning the volume up or down without having to stop and grab a remote, also amazing. Turning my system off mid game, then turning it back on and it starting right back up where I left off no loading..amazing.
Snapping, the friends list management and the UI (and the constant updates to improve it) give me that all day. There's more that I just don't feel like typing out...
But if we really talking about hardware, the PC is the winner and if we talking about games, imo the xbox wins right now...but that's opinion. This upcoming year I can see sony one upping microsoft game wise. At the same time nintendo is gonna have a nice year too.