I work in print, and the Mac is much better for pre-press than the PC.
It handles fonts better, workflow better and CMYK color space better.
Ed
I’ve been in pre-press and graphic design for years also and had no problems using Adobe products for CMYK as well as spot color output on a PC (Win XP, Adobe CS Suite). I was expecting a horrible experience as I got into Macs when they WERE the only way to do high-end graphic work. I was surprised and relieved. I also controlled the systems in the shop so I didn’t allow a lot of third-party stuff. That may have helped.
I’ve had more font issues on the Mac than I did on the PC as most of the clients of the company I worked for were on a PC. When I needed to take files home...well, you know the rest.