Actually, AMD's drivers are horrible if you have a multi-GPU set-up, sometimes it can take weeks/months for AMD to get around to adding a game to it's crossfire profiles.
I had to wait like a month for profiles for Skyrim to run it on more than one GPU, thankfully the games crap interface forced me to run in one monitor anyway so the performance wasn't an issue.
You also can't forget the frame latency problem that AMD is working on fixing at the moment either, which has been a massive problem for years.
However, with that said, nVidia did a *massive* fumble when Windows Vista launched, nVidia were responsible for about 30% of the OS's total blue-screen crashes, so it's not like they're infallible either when it comes to drivers.
But generally, for Multi-GPU gaming, nVidia has the edge. - For single card gaming (Which are the majority of GPU purchases) there isn't much in it and both would work perfectly fine without any dramas.
--::{PC Gaming Master Race}::--
