There is no other choice but Mac. Whenever I'm on a PC because an office forces me to use one, I swipe the network connection and run it into my PowerBook. Fortunately, being an editor keeps me pretty Mac happy as FCP and AVID run on Macs. Sadly, these days, AVID has it in for Apple and they've been running cheaper systems on Windows - which really blows because the architecture of Windows is not media savvy. It's so much easier to navigate through OS X to work on mulitmedia projects than it is on Windows.
Windows is great for IT people to run the office with an iron fist because no one can understand how the hell to work through all the lame network scenarios. Oddly enough, whenever their precious Windows system fails, they hate to come over and fix it. I'm always amazed at how many steps it takes to do anything on Windows! Why would people put themselves throught that?
With that non-pithy comment out of the way, I can't honestly say how I would react to a new system. I'm pretty stuck in my Macintosh habits. And for post-production, it would be a long while before a new system was able to wiggle its way into that world. So, I can't imagine switching right away. There would be so many determining factors since I'm not just a web browser and e-mail type of guy.
Interesting thought though. The possibilty of another major operating system in the consumer market would be pretty wild.
pJ
Confessions of a Mac Zealot