I've used macs and pcs, and I would argue for the pc, plain and simple osx is excellent, better then windows, but bang for buck is way better on a pc, also upgradeability is far better on a pc, and I like to tinker :). PCs (or windows PCs) do suffer more with viruses etc, that is because many hackers dislike microsofts way of doing business and windoze is full of security holes. I mainly use Linux on a PC, switching to windoze for the odd game. I think a few years ago talking linux / open source would have earnt me my geek badge instantly, but nowadays this stuff is getting really good, it honestly can be worth considering getting a linux machine for the average joe public and bryce will run in WINE (provides an application layer for windows programs). Advantages of this are PC box is cheap, open source software is free, and linux is very stable and I would say less resource hungy, which leaves more resource for rendering......

Final nails in the coffin for me with respect to macs are that 3ds max doesn't run on a mac and neither do that many games, and I like to play games now and then...

That said last mac I tried was an early imac and they will have moved on since then.

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.