I would love to toss in the good old "Nvidia drivers are better and more reliable", but their more recent drivers proves otherwise (for gamers at least)
The only issue I've had with my Nvidia driver is that I can't run Deus Ex: Human Revolution (not that it isn't powerful enough, it just won't run. When I run it with the Intel integrated graphics it works fine - some random driver issue that even ATI cards have)
However, compared to the awful ATI drivers I've been subjected to over the years (had a HD4850m in my laptop and my friend has a HD5970 and HD6850), the Nvidia software that I use with my GTX 780 is brilliant. I can update the driver within the software with one click of a button! Not like my ATI card, where I had to go to the AMD site to find the correct driver version for my version of Windows. And then when installing it, instead of detecting and removing the previous driver first, it installed it
alongside the existing one. A few times I even had to use DriverSweeper to get rid of the dang thing! To me, the ATI (now AMD?) drivers just seemed so un-intuitive. Obviously this is just my opinion, and I haven't personally used an HD7*** series card, so it may be a lot better now.
But that was the main reason for switching from AMD to Nvidia, as well as in my personal experience, ENB mods run a lot better on Nvidia cards than ATI cards (and I use lots of ENB mods for Oblivion, Skyrim, Fallout 3, Fallout NV, GTA 4, Deus EX HR when I get it working)
Anyway, rant over, I just thought I'd share some of the other aspects that I've found to be important when choosing graphics cards.
Blazin