Specifically:
* HiDPI support in all apps, whethere they are aware of it or not.
* Built-in PDF editing and creation from all printable content.
* POSIX scripting and CLI.
* Very clean and consistent configuration system (defaults). Reset an app to factory? Delete one plist file and potentially an app support folder. Got a new Mac? You could even boot it up from the old harddisk. Good luck doing that with windows registry.
* Touchpad support.
* Systemwide fulltext search with indexing and complex search terms. Somehow MS still hasn't caught up with 10.4 Tiger it seems to me.
* Superb discoverability of power user features with in-app help system and hotkeys displayed in the menu.
* A consistent menu system.
* Powerful and system wide screenshots.
* Very good screen calibration out of the box
* Cmd-C / V work everywhere, including the Terminal.
* Very good terminal with good color schemes, tabs, unicode and even emoji support.
On the other hand Windows has:
* The best keyboard-only UI (although ribbons were a big step backwards in that regard - very hard to discover now)
* The best graphics drivers
* The best Office version (although Google Docs has mostly replaced the need for me)
* Windows-P, I really like that menu
* The Windows 10 task manager, pretty neat.
* Pen and Touchscreen support.
Overall MacOS beats it hands down for me when it comes to productivity.