PC. I have 6 PCs in my studio, and one Mac. The only reason for the Mac is Digital Performer, I can't stand to work with any of the PC DAW apps, the editing sucks in comparison. I have nothing against the platform, except for error handling. When something goes wrong on my PCs (and it doesn't happen very often except on my test bed box, where I am always installing/uninstalling to test apps,) I can usually get a pretty good handle on where to start looking - hardware, software, OS, app issue, etc. On the Mac it's WTF?
Plus I have major issues with Apple's business plan, I have been burned many times by the company as they change hardware i/f options (remember the ADB port? I've got $3000 worth of peripherals in the dumpster because of that one, so I do all my photo and video editing on the PCs now...)
I buy these boxes as tools. Not general purpose machines, because Jobs has deliberately crippled them. I expect no more than what is in the box when I buy it, but even there I have been burned (I have several mics for the Touch that worked great until they were shut off with no warning by an OS upgrade. How long before they find a way to cripple the USB port adapter? After all, several companies sell high-quality, near-pro-grade USB mics, allowing them to make a profit on an Apple device, and we know that just makes Stevie furious...
But at least with the official Apple Camera Connection Kit I can record on my Zoom onto SD card and import that way - they did specify it would read photos and video from SD cards, but they did not state it could recognize general data. Still no storage per se.)