main reason for favouring OS X is the lack of viruses, trojans, worms, RATs, rootkits, etc. there are far more that affect XP and vista. poser (for me at least) has been unstable since P5, and given the comparative lack of poser-related utilities for OS X, there's little or no poser-related advantage IMVHO. however, the new machines will boot into either OS X, Xp, or some versions of vista, hence if ya buy a mac, ya can still use some windows versions.