^ What Caeden and Rolli said..... but , I will disagree about the driver issue in one respect. I won't to a build w/ 3 ATI cards in CF ...... and with just two cards, it's no secret that nVidia has historically and still maintains an edge here tho the gap i now slim.
I like the ATI cards better in the lower price segments and the nVidia cards from $200 on up. The best "pound for pound" card made today IMO is the factory OC'd 560 Ti.
Hi resolution .... on 2560 x 1600 monitors, ATI has the edge.
On video editing and other CUDA enabled apps, nVidia stands alone
For Graphical extras, gotta give kudos to nVidias PhysX ... ya might not miss it, but once you have enabled it in a game, as the THG article said, you will NOT turn it off, as long as your card can handle the load.
3d Implementations - http://www.tomshardware.com/reviews/tridef-stereoscopic-3d-gaming,3019-22.html