[identity profile] anton-p-nym.livejournal.com 2011-01-22 02:36 pm (UTC)(link)
For me (aka, "anecdote") I'd say XP was stable after SP2 came out, save for one or two exotic issues on my first-generation UMPC that were ironed out in SP3.

Windows 7 has always been rock-stable on my desktop, impressively so given that it's home built by a hack-amateur like me.

Win7 does flake out on my third(?)-generation UMPC but that's likely because the hardware was built around XP and then modified to run Win7 by a third party. It'd be much more stable if the OEM would release a proper Win7 driver for the touchscreen... but they don't seem to have much incentive to do so.

-- Steve can see how "roll-your-own" OSes will retain stability issues long after others have solved the problem; so much more variability in hardware and OS configurations to take into account, it's a much more complex problem.