I've seen a larger amount of instability in Windows than in Linux. Having a stable ABI doesn't help much.
Windows also has a more robust architecture where it matters, like the fact that a GPU driver crash doesn't kill the user session (windows can reload that subsystem while keeping the user session running since Vista), whereas it can either kill Xorg or just outright freeze the system on linux. A very useful way to architect the OS, although I've only experienced it on Vista and had more stable GPU drivers from 7 onward.