Games that I've played recently that I consider good, and you can get on both consoles: Batman Arkham City, Battlefield 3, Skyrim, Assassin's Creed: Brotherhood, Dead Space 1 and 2, Bioshock 1 and 2, Vanquish, etc. Come to think of it, I played about half of those on XBox and half on PS3, and a few on PC.
I've even mixed platforms in the same series. Eg:
AC1 - PC, AC:BH - XBox
Bioshock 1 - PC, Bioshock 2 - PS3
Dead Space 1 - XBox, Dead Space 2 - PS3