The majority of the industry use PC/Windows. Forget the Mac as Maya 8+ is very buggy and tends to crash alot.
Its not 100% tru that macs are virus free they are just not. Especially since they are x86 based now. Even under Risk Chip there was one or two viruses.
Stick with what you know, if you already know windows stay with it.
Chris (formerly R@nSiD)
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When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)