Why would you put THIS as the title...
Anyways, the equivalent is the GTX 770, but you can't really say which is better. It comes down to what kind of games you play, and that too they will only be marginally better.
NVidia: Cod, Battlefield, Runescape (would you believe that), Borderlands, that kind of stuff, Metro, DiRT
AMD: Crysis, Civilizations V, Skyrim, DirectX 11
Basically, NVidia cards are better for fast, calculative tasks, whilst AMD cards are better for heavier duty.