Driverheaven made an extensive comparison between both technologies and the results are quite surprising,if in games the IQ between both companies don't differ much, in the video area there are alot of differences.
But I for one would tweak the sliders until I get the results I LIKE not the defaults of each tech.
It would be fair to say that the image quality we obtained from ATI and Nvidia hardware has given us a lot to think about. On one hand we have ATI with a superior level of detail; on the other we have Nvidia with much more intense and realistic colour, not only on skin but many areas of scenery too.
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