If you were playing Unreal Tournament 3, you'd have a very hard time differianting between 120 and 150 frames-per-second, so in this benchmark, the edge goes to the ATI cards, both the HD 3870's and the sole HD 3850.
But across the board, for all of these cards -- even the slowly aging BFG 8800 GTS 320MB -- every GPU is powerful enough to max out Unreal Tournament 3, and achieve high framerates.