photonboy :
Here are the PROS and CONS:
AMD:
- supports MANTLE for the upcoming BF4 update and future games. Initially not many, but it's a factor.
NVidia:
- SHADOWPLAY (record game video up to 1080p 60Hz with minimal performance hit)
- PHYSX
- G-Sync (for new monitors this year. Smooth game play with minimal lag. Amazing tech, but again new monitor required)
So there isn't a right answer for everyone. You also need to look at the BENCHMARKS and compare non-reference models like the Asus DC2U cooler.
Those are more marketing gimmicks than anything
BF4 is AMD optimized so if you play that game then look towards AMD
AMD has much better multi-monitor support
NVidia has much better multi-GPU support
AMD has wider memory bandwidth and generally more memory for similar prices
AMD has better compute performance
NVidia high end cards did have much better coolers but the R9 aftermarket coolers are finally out
Mantle is unproven so I wouldn't rely on it much
Physx is useless
Shadowplay maybe useful for some but software recording works fine
G-sync needs a proprietary monitor
Take your pick
Fanboy flamewar may be coming.