OS X has many merits on this front, but since 10.3 I've found that the first few dot releases of OS X have the same caveats often enough (both in terms of bugs/hazards and in terms of gratuitous UI "progress") that it usually seems better to wait past .x.4/5.
Now there's this, of course.
Since the problem showed up in 2011, maybe I should go back to Snow Leopard; I can't think of a single valuable change to OS X since then...