Pros: XP Pro is very stable, runs games well, has good built in features.
Cons: Still does not allow the control that Linux does, but is less hard to run.

I am a huge fan about xp pro w/sp2 for several reasons. First, it cleaned up some problems that were associated with sp1. Also, XP professional allows much more control over the gui and computer as a whole. Also, if you are a gamer, XP pro runs more stable than home in gaming situations. This allows for a more fluid gaming experience for you with little problems at all.