Its more of a traditional thing, since technically, a windows PC is now more than capable of doing the job.
If you work in a design company the chances are you'll be using a Mac
In the nineties, macs had better support for color matching, and their screens are calibrated closer to print work than PCs (PC default to a TV gamma). The differences in support for print color workflow are now pretty much mute.
As for ease of use, I would say Macs are better, but that's my opinion.
If you want a Mac, then go for it, but if you are happy with your PC, then you can use the same software and fonts, and after all, its the ideas in your head that count, not the type of computer you use to realise your ideas