All of my discrete video cards since the early 2000s have been Nvidia, simply because that's when I switched to Linux. For the longest time the ATI, later AMD, Linux drivers were laughably bad, while Nvidia's Linux drivers were more or less on par with their Windows counterpart. So it really didn't matter if ATI/AMD had superior hardware because it would still perform like ass on Linux. That has changed over the last few years, namely with AMD open-sourcing driver tech specs, something they did many years back, but it took some years to pay off (Valve also had a helping hand in getting AMD drivers up to snuff). These days I'm not stuck with Team Green, there are good Linux drivers for Team Red, and Team Blue, for that matter.