Ecosystem integration. I find macOS less buggy. I find Finder easier to use than File Explorer. Quick Look is a big reason. The Mac version of the software I use for work is far more stable than the Windows version, but that’s specific to me. Preview does so much. Time Machine is indispensible. iWork is free and does everything I need. macOS just seems better put together with all common functionalities already built-in and ready to go, where as in Windows you have to go searching to download apps for everything, sometimes paid. It’s hard to think of all the specifics right now but I feel like macOS’ way of doing things makes more sense than Windows’. Windows also has too many updates.
I grew up on Windows and switched to Mac as an adult. It was weird at first but I quickly grew to prefer it. I’m sometimes forced to use Windows for work and I always find it annoying.