both companies make very good cards. right now it's too early to say what'll be the best series of cards, because we just don't have enough next-gen games - but after a few months it should be clearer what's truly the best buy.
ati is usually faster when anti-aliasing is used, but nvidia has a history of releasing some awesome drivers, and their cards are just stuffed with raw power.
this has been discussed to death though, so for more info please read the other threads.
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