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I don't. All I care about is ease of use and the amount of time it takes to maintain and manage it. Macs generally win that battle. PC's on the other hand make 'operating' your PC a task and virtue unto themselves. If you're the kind of person who enjoys having your equipment get in your way, then buy a PC and have at it.
XP will be the last turn of Redmond crank here. And when it's time to junk everything it will be replaced with Macs (BSD based OsX) of some kind or Ubuntu or Linspire.