Mac ... doesn't get viruses, adware, crappy software installed on it, works everytime, never needs reformatting, plays 80 tracks of audio at once without complaining. Has all the important tools on it. Crashes completely occasionally, but sometimes not for a week or two. Never has problems with drivers/timing/audio latency/conflicts/irqs etc.

PC ... has millions of little soft synths, plug ins, music tools written for it, crashes rarely, but has endless driver issues and problems with crappy software of one shape or another. Gets viruses and internet security problems like nothing else on earth...