Im with Nvidia, Cheaper and petter way petter performance.
But that's my persenal choise.
By the way that's not even the strongest one and it's still cheaper.
EGA Nvidia GTX 480 Hydro Copper FTW
Performance
NVIDIA GTX 480
750 MHz GPU
480 CUDA Cores
400 MHz RAMDAC
Memory
1536 MB, 384 bit GDDR5
3800 MHz (effective)
182.4 GB/s Memory Bandwidth
Interface
PCI-E 2.0 16x
DVI-I, DVI-I, Mini-HDMI
SLI Capable
Resolution & Refresh
240Hz Max Refresh Rate
2048x1536 Max Analog
2560x1600 Max Digital