Its all dependant on so many factors that you wont get a straight answer. Some will say that ATI is better others will disagree. I have found that the average ATI card has OK quality whereas nvdia card go from bad too superb depending on make. My current card is a galaxy 6800 and its much better than my previous AIW 9800 (which was grainy, washed out and had big gaps top and bottom of screen). All I would say is that nvidia cards are generally easier in a tv-out only config whereas an ATI would sometimes needs to be manually switched to s-video output via a shortcut key.