^Incorrect check this out Ubisoft games on X360 = 33 games. PS3 = 20 games
Most multi-platform Ubisoft titles on X360 heavily outsell PS3. Taken from VGChartz game sales data.
http://vgchartz.com/games/index.php?name=&console=X360®ion=All&developer=&publisher=347&genre=&keyword=&boxart=Both&results=50&order=Hits