I've always seen better performance from ATI though, anyway. All my computers were ATI, all my dad's computers were Nvidia, and frankly, his all sucked...
Laptops don't have to have bad graphics cards, they are simply usually limited in modifying them, thus making it important to get a good laptop when you buy it. My laptop's graphics card can match any desktop, and exceed that of most desktops I've seen anyway. I know that windows experience index is a bad way to compare things, but having no other benchmark, my laptop hits 6.6 in both graphics (it's a scale from 1.0 - 7.9), and its the highest out of the categories.
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Laptops suffer from too many stereotypes because of some bad laptops. If you keep away from cheap laptops, you'll find plenty of hidden gems... Oh, and don't buy unknown brands, no matter their "stats", because they tend to perform worse than better brands of the same "stats". HP is my official favorite now, after performing so good for me for so long...