My comments about the audio industry and Macs were more about OS X as an OS for audio use, not about Apple's hardware (and their lack of regular releases).
Windows has made great improvements over the last few years and it's pretty much caught up, I think. It's just that most studios are still mostly on OS X.
For my setup, Cubase with a couple of RME cards, UAD cards, and the plugins I use, OS X is measurably more stable. I know this because I haven't owned a Mac Pro for a while, but I've run OS X on PCs for about 3-4 years now. Out of interest, I compared to WinXP/Vista/Win7 - it would lock up every few days, hang a lot more often and not clear its RAM cache like OS X does. I couldn't deal with it, as it interrupts my workflow with clients too regularly.
I've absolutely no doubt that in many other applications, Windows (and particularly other *NIX systems) smokes OS X.
As I've said elsewhere, I'm certain that most people who own a Kemper use it on Windows because outside of the studio world, Windows is still about 80% in use.
This is why as a studio owner, I'm a bit disappointed that the OS X version will be later than the PC one (and I don't understand why that happens), but I'm very much looking forward to putting it into use.