This was a while ago, but I think I actually liked the tv out from my radeon 9500pro more than the output from my Geforce3 Ti200. I'm not sure if that would apply to you. (Are you talking about the Geforce4 Ti cards?)
The component out from a 9800pro and a 6600gt were both very good.
I didn't notice any quality difference changing from s-video out on my 9500pro to my 9800pro... both were very good.
I think I remember the Geforce3 being slightly worse (not as much control over sharpness, flickering, etc. but this may have changed with new drivers).
note: I had reasons for getting several many cards from basically the same general performance level
