I don't know, well...  Based on what SharkyExtreme was saying, ATI will have to try and keep their shipping dates on time & try to have a faster product developement cycle.  With the rate nVidia is going, a new chiset every 6 months, nVidia is pretty much grabbing every customer's attention, so...
ATI always has the best picture quality tho, if not the fastest in gaming performence.  I do watch DVDs alot, and I think everyone addicted to DVD movies knows the top performers in DVD playbacks are the ATI and S3.  ATI being first, S3 being second...  I have a Viper II right now, the DVD performence is quite excellent but the problem I am having is actually the 3D acceleration.  Check Sharky Extreme's "In-Depth" section for Viper II in-depth.  Viper II cards have problems in deciding object depth and stuff, and it often renders objects incorrectly (Which is something I noticed also).  I am planning on selling it to my cousin soon, so I can probably get a more high-end and seriously accurate graphic board like an ATI or nVidia.  My only concern about nVidia is their DVD performence, otherwise their gaming performance should be ok.