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/www.anandtech.com/systems/showdoc.aspx?i=3666&p=18
When comparing Windows and Mac OS X, Apple’s strength has been integration and the GUI. Microsoft can’t do anything about the former, but they have about the latter. Apple still has the better GUI, but the advantage is not quite as great as it used to be.
Without getting in to hardware, Snow Leopard has been even more stagnant than Windows has. Win7 brings some definite advantages over Snow Leopard: per-application volume controls, a wide audio/video codec selection (Apple’s the odd man out here; even Linux has them beat), SuperFetch, TRIM support, and of course all the applications Windows can run. Meanwhile Snow Leopard has its GUI, along with Apple’s gesture system, Exposé, and Time Machine.