The "bricked" iPad problem only affected a very small proportion of them and was easily sorted out. The internet rumour mill made a much bigger thing out of it than it actually was.
It has to be said that Apple's Core Audio and Core MIDI do pretty much "just work" and OS X, being Unix derived, is much less hassle to deal with than modern Windows. When you tell it not to do something it doesn't then go and switch it on again behind your back without telling you. Unlike Windows 10.
There were a few issues with El Capitan on launch, mostly caused by a few hardware manufacturers not updating their drivers despite many months of warnings and pre-release developer versions being available. The only one that affected me was MOTU who took a week to get a working USB3 MIDI interface driver out.
A lot of older hardware will work on Macs because if it's class compliant it doesn't need a manufacturer-supplied driver. As for old stuff working with Windows, I've seen a succession of M-Audio products left to wait for years for a working Win Vista, then 7, then 8 driver. Which doesn't work properly when it finally gets released. Which is why I won't buy any M-Audio products any more.
Having loaded Win10 to take a long hard look at it, I have no desire or intention to use it.
The big downside of Macs is cost, and they tend to have less brute power than a similar priced PC. On the other hand, OS X seems to make fewer demands than Windows and requires no special tweaking to use as a DAW. Mrs TLW has a work-supplied i5 laptop PC with 4GB of RAM and Windows 7. Her base-model Macbook Air (i5 4GB RAM) is far smoother and snappier.
And no Sonar for Macs. Yet. Logic's cheap and OK but frustrating in some ways, and the supplied plugins are mostly not as good as SPlat's so there's more of a need for third party plugins. At least, that's what I've found, others may disagree.