http://www.eurogamer.net/articles/digitalfoundry-street-fighter-x-tekken-face-off
360 version has frame skips. Add that to shared dlc between the Ps3 and vita versions, more characters, same console coop on ps3, ability to share dlc and you have a clear cut winner.
For the guys using controllers, the 360's d-pad is absolutely shocking as well. The PS3 is essentially the definitive version hands down.