hmmm this is a bit lengthy but...
... most audio apps were written for mac and ported to pc, cakewalk and nuendo are exceptions. Id say that you shouldnt understate that macs are all done by one company and 3rd parties are coordinated around that. The fact is that there are far fewer problems coming from the mac world for stability and compatability. All these guys talk about how "flawless" their pc's work, then one week later they try to inbstall a piece of software and are pulling their hair out, or their machine does the "blue screen of death" out of the blue( as a mac user I dont know what a blue screen looks like), or they buy a soundcard that has conflicts with their chipset or graphics card. As Ive said, this is not to be understated if you spend a considerable amount of time on your machine; the overall quality of your experience has to be a factor.
While linux is similar to unix, the mac os 10 is above and beyond either with its new gui and conception. Also, Id state that there is no shortage of mac software unless your into video games. Virtual pc will run app's from the windows world on your mac as well.
In fact the old macs gui is above and beyond windows. How many versions of windows has there been, theyre all on the market at once to do different jobs that one os should do. And none of them do it particularly well. The windows os has so many patches its atrocious. Now with os 10 to compare the mac os to window's is a joke, maybe BE OS perhaps.
Every developer working with mac is supporting os 10, and many unix and linux developers are porting over because its simple to do.
Really what I like about macs is this: I install software by simply clicking the mouse once. I install hardware by plugging it in. My machine doesnt crash. The os is seamless and elegant. For app's that support altivec the mac is a more powerful platform(think photoshop). Its a pleasure to use this machine, it really does affect the way I work in posative ways due to its overall conception.
I think for desktop publishing apps, anybody who says pc is even close isnt really involved in the industry, photoshops performance on a mac stomps all over those peecee's. For video, most people use macs. For audio most professional users run macs, but really a good pc will do you just fine.
The thing is my machine is something I work on every day. Value for me goes beyond price/power to overall quality of my experience. To me a mac is the best thing besides dedicated hardware or dsp's, its just more elegant and stable, with a better conception. The reasons for this I dont know, but I know this is true.
How many mac users say yech this sucks and then get a pc vs how mant dump the pc and get the superior mac machine? The mac os is superior, the hardware is competetive, and its altivec velocity engine gives it an edge for apps like photoshop.
Personally I run a mac and my next machine will be a mac as well.
A pc is great for word processing, and secretarial duties but otherwise get a mac and dont look back. You dont need a mac however, if you get a pc youll be just fine. If you like those 'make the music for me deejay' softs then youll want a pc.