Which graphics card is better?

[Bruniko1]

Hello. I want to buy a new computer and I don't know which graphics card is better.
I want to buy a desktop computer with this specifications:

• Processor: Intel Core i5-2300 / Intel Core i5-2310 / Intel Core i5-2400 / Intel Core i5-2500 / Intel Core i7-2600
• RAM: 4 Gb / 6 Gb / 8 Gb DDR3 1333Mhz
• HHD / SSD: 1 Tb SATA2/SATA3 7200 rpm SSD: 120 Gb / 128 Gb
• Graphics Card: AMD Radeon HD 6850 1 Gb DDR5 / NVidia GeForce GTX 550 1 Gb DDR5

I want to know which graphics card is better. Please, help me!

Thanks

 

[vistakid10]

Looks to me like the 6850 wins - GeForce GTX 550 Ti vs Radeon HD 6850 – Performance Comparison Benchmarks @ Hardware Compare but the GTX 550 Ti is a tiny bit cheaper.