Let's face facts- the discussion whether Mac Pro, seen from hardware point of view, is still for pros or not could've taken place the very moment Apple decided to switch to Intel architecture. Now it's quite obvious.. there's nothing special about Mac anymore. It was the moment when they become the same computer as a PC, the difference was a beautiful and appealing aluminum box and, more importantly, the OS. It's literally THE SAME architecture, it's only OS that makes any difference. And the fact that you can get a monster-PC which is probably 2 times faster and twice as versatile for the same money as a Mac Pro (at least thats the case in Central Europe). Speaking of OS- neat and tidy Win XP (you have to know how to care for a Windows computer) with service pack 3 and *ALL* updates was as stable as they get in terms of Adobe Creative Suite applications, 3d software, rendering, etc etc. I've been using macs and pcs for years in flash/photoshop/illustrator/indesign and even though it's hard to crash Mac OS, the Adobe applications were crashing as much as they were on Windows based PC ( = they weren't crashing much, even though I squeezed the last drips of sweat from both while working with huge files). I don't have years of experience with digital backs software, but my back is 1.5 year old and during that time, using latest versions of C1 and earlier- Leaf Capture, I didn't notice any stability difference- neither in processing nor in tethering. My point is that a 'computer for a pro' is a computer which delivers. Nothing more and nothing less. And that's the case of your own habits and experience, whether you feel more comfortable with a Mac OS or Windows, it's a SUBJECTIVE choice.
Many years ago, Mac was the industry standard. Why? Because there wasn't really any competition. Now it's also a standard and a default platform, but it's due to the fact that people are USED TO Macs. Macs are not better. You can talk to Apple zealot and he'll try to convince you that Apple is far superior in all possible ways. Don't believe him, and him stating such things can tell that he's not a pro. In fact, there is one exception from this and that's movie (and more generally- motion) industry- the software for Mac is industry standard so there's no other solution really. Other than that and maybe some niche applications- it's only your own preference and subjective choice- you have to decide with which you feel more comfortable: is it a good-looking, gorgously designed not-so-high-end machine which is uncustomizable and expensive but has accordingly good looking and intuitive OS or is it an obscure plastic box with a rip-off OS, which will fit all your needs and more in terms of power and versitality for half the price of a Mac. There is no perfect solutions. For instance, for me the biggest benefit of working with a Mac is the aesthetics. I know I'll feel better when I draw, design, work on typography etc etc in Mac environment, because everything which surrounds me there is aesthetically appealing. It's easier to focus and not be disturbed but awkward and ugly design of Windows, even their fonts- I find them to be disturbing. I just don't understand how would any pro make a choice of their platform looking at the charts or thinking that a Mac equals rock-solid stability in comparance with a Windows PC. Maybe quite a few years ago, definitely it's not the case nowadays.