I've been wondering why it's still just ATi and nvidia. Nvidia does more things that I like, but they're not quite perfect (good enough though). They have good filtering, more natural colors, better GL drivers, better depth precision (ATi uses some z-range hack and only offers a 16 bit z-buffer in Shadowman), and extra features including PhysX, plus AA works with more games on nvidia hardware.
Unfortunately, they don't emulate dithering nor do they emulate the w-buffer properly. Neither does ATi. The former isn't too much of a problem because of nglide, but there are still some older dx games that haven't been treated.
Unfortunately, they don't emulate dithering nor do they emulate the w-buffer properly. Neither does ATi. The former isn't too much of a problem because of nglide, but there are still some older dx games that haven't been treated.