For me, it's a toss up. I know ATI has the most advanced and the fastest graphics line of cards, the 5000 HD series. But I've always done all my gaming and everything on Nvidia chipsets. The ones I've used were the Nvidia Vanta (released in 1999) and the Geforce 9100 integrated graphics chipset (released in 2008, I believe), so I'll vote for Nvidia.
We voted and discussed what processor brand we liked. Now let's do the same for the graphics brands. What are your guy's favorite graphics manufacturer of these companies? Vote and discuss below.
Oh, and by the way, S3 used to be a 2D graphics manufacturer 10+ years ago. But recently they have some extremely powerful 3D integrated graphics chipsets. In other words, it appears they're trying to make a comeback into the graphics market. Just thought I'd throw S3 into the poll to mix things up a bit.