Which is better video card for playing games?

ATI Radeon HD 3870 512MB GDDR4 PCI-Express Video Card or BFG GeForce 8800GT OC 512MB GDDR3 PCI-E Dual DVI-I HDCP HDTV Out DIRECTX10 Video Card|||Nvidia GeForce serie have the best there is. theres no doubt about that, and they allso supply you with free software sumtimes! lol i installed my driver for my GeForce a couple weeks ago i got HL2 nad 2 other games FREE on steam lol:D go for it.|||I like the second one better.