Re: nVidia vs ATI graphics on Linux?
I have always had better luck with nvidia. last year I decided to give ATI another try on 3 or 4 boxes, and while it is much improved, ati is still a major pita.
I would go with nvidia but check compatibility info on your specific series, or if possible the specific card. for instance, the geforce 82-8500 cards have minor incompabilities with the drivers needed for tv outs (overscan control is not provided). i rather wish i had known that before purchasing.
Things are rarely just crazy enough to work, but they're frequently just crazy enough to fail hilariously.