I agree with everything here except that I find the Windows 10 UI to actually be quite nice and fairly consistent. Cortana works better than Spotlight on OS X,

I agree with everything here except that I find the Windows 10 UI to actually be quite nice and fairly consistent. Cortana works better than Spotlight on OS X, and it doesn't cover up the middle of the screen to boot. I can actually do arithmetic with it without covering up the article with the numbers in it. The Windows 10 virtual desktops are basically a copy of Mission Control, except a bit nicer. Windows doesn't hide your desktop thumbnails by default the way that El Capitan perplexingly does. The window snapping feature in Windows 10 is vastly better than anything built into OS X by default. The split fullscreen view in El Capitan is a joke and extraordinarily clunky compared to just being able to snap windows to any half or quarter of the screen in Windows 10.