Umm...
Emagic's Logic ran perfectly well on Windows until the day that Gerhard Lengeling sold Emagic to Apple, and Apple swiftly discontinued Logic for Windows in an attempt to force all Logic users to buy Macs. Instead, much to Gerhard's dismay, they went to Steinberg's Cubase (Gerhard and Charlie Steinberg once had a kind of Jobs/Wozniak thing going, but later split... and it wasn't amicable until they smoked the peace pipe -- literally -- at the Frankfurt MusikMesse in 1997).
As for "superior to Pro Tools", technically a lot of things are superior to Pro Tools, the problem is that you would be laughed out of any studio if you barged in and made the above claim. Pro Tools is the industry standard whether we like it or not (I personally don't care for it).
The big Mac advantage from a DAW point of view is CoreAudio. Windows wasn't built for DAW purposes, they tried with the WaveRT API in Vista but it was about as successful as the WMA audio format, i.e. noooooot. When it comes to low-latency audio out of the box, Mac wins hands down. The software argument, however, is pretty lame. 90% of all professional music software (and 100% of the essential music software) runs on both platforms. Cubase, Pro Tools, Reason, Ableton Live and a zillion VST/AU plugins. Sure, Mac does Logic but only Windows does WaveLab, Adobe Audition, Sonar, SF Acid, FruityLoops, ReBirth and a lo-o-ong list of other apps that many would never trade for Logic even at gunpoint.