I feel like the "stable" part of things has been eroding away lately. I've been very disappointed with Apple over the past few OS rollouts. The new FS went flawlessly but there have been so many fit and finish bugs, I feel like Microsoft is making it.
I hear it's not very good/stable now, but running a Hackintosh system of Snow Leopard - Yosemite on various hardware worked pretty well. And that's without them trying to optimize it (I guess).
Which is literally the reason why OSX is that good/stable.