gtx 660 vs. radeon 7850

[laterterror]

I was thinking about buying a new graphics card for my computer and I've been stuck between the two, both the 2gb gigabyte models, and yes they are both fully compatible with my pc. They are both the same price and both have similar clock rates, so could someone please tell me which would be better to go for.

 

[bigcyco1]

The GTX 660 is faster then a R7850.