OS X is just another operating system. You can run pretty much the same apps as Windows (with some differences of course). I personally prefer OS X to XP. Others will have different opinions. In general, either platform will get the job done. It boils down to which specific software you need for your work. I use my Mac for just about everything, including working in Maya. The only reason I even own a Windows machine is to run 3DS Max (which is Windows-only) for my freelance work.