It is worth remembering that OSX is just BSD (Mach/XNU kernel) in a pretty dress.
And BSD has
serious street cred (the extraordinary thing about the tangled mess that is Windows is that with a minimum of care-and-feeding it is surprisingly stable).
Mac
[I do have one quarrel with Yosemite and that is the problem with non-Apple aftermarket SSDs - a difficulty easily fixable by Apple yet who (so far) refuse to do so]
