Quark and poser also run on PCs. Poseer, being a 3d app could run better on a PC because of the commercial-grade 3d cards like the FireGL work with PCs but not macs.
If he does get a mac, make sure its one of the the ones that can run windows if he decides to bail from macos later. macos might be an interesting way of getting his feet wet in a unix-like setting if he's never messed with linux or *BSD.
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