I would like to add a couple things from a developers perspective:
I’ll always lean towards PC on the plugin front, because more people develop VST than they do AU or AAX/RTAS. You have to actually apply to Avid to get their Protools SDK…my personal experience with that is they never got back to me.
I’ll always lean towards PC on the operating system front, because OS X updates (which are numerous and frequent) are pretty bad at breaking things like the Cocoa API, and sometimes hardware, whereas Windows hardly changes between iterations - in other words MORE BACKWARDS/FORWARDS COMPATIBLE. Going back to plugin formats, VST has been around for decades, mostly unchanged, and Apple occasionally redoes Audio Units - again, less backwards/forwards compatibility.
I’ll always lean towards PC in terms of price, because MACS are generally more expensive for the same amount of performance (you are paying more for a brand.)
I’ll always lean towards PC for ease of upgrade.
As far as VST/ASIO vs AU/Core AUDIO, Mac seems slightly more stable, but I have seen Logic Crash plenty of times.
I think with Mac you are really paying extra for the “feeling” that it’s better, but I think really you are more at the mercy of Apple and a handful of Apple approved developers. A couple decades ago, Mac and Protools was the STANDARD for recording and tracking, because nothing else could do it as well. Now, everything works just as good.
One PRO TIP I can give you if you do buy a Mac…make sure to install OS X updates on different hard drive partitions, because otherwise something will inevitably get broken by an OS X update and you will either have to re-install an older version of OS X (sometimes a challenge itself) or be SOOL.