How is OS X working much better than any OS? Windows 10 is looking mighty fine, and runs very well even in an unfinished state. I can do everything I need to do in Windows 10 that I currently do in OS X.
Now, your personal preference is that OS X works better than any other OS. In fact, I agree with you. But my point is that it's all personal preference. You look at OS X and see an OS that is fine the way it is, someone else looks at it and wonders how people can possibly prefer it to Windows or Linux. You look at iOS as stale, I look at it in the same way that both you and I look at OS X- an OS that works much better (for me) than any other mobile OS.
There are things I dislike about OS X, and things I dislike about Windows 7, but I still use both almost daily. Windows 8, on the other hand... I absolutely hated. It is just not suited for mouse/keyboard use. It is most definitely built for a touch screen.
I have not used Windows 10 yet, but I will be upgrading later in the year. I'm curious how it compares to OS X in the areas I find most usable: multiple desktops, and multi-touch gestures. The 3-finger full-screen and desktop switching is just amazing. Scrolling is incredibly smooth. Two-finger "back" and "forward" gestures are perfect. 4-finger pinch for quick access to apps, awesome.
So even though I don't feel that OS X is the absolute best OS (I don't know if I can honestly pick a best), I really feel that the gestures completely make the experience. That was what sold me on buying MacBook Air when shopping for a new computer 4 years ago (after using Windows since 1995). How does Windows 10 compare in this regard?