I don't know why, but MacOS feels more high-quality than the other desktops. I use Unity on all my computers and haven't run MacOS in years, but I think there's more "tearing" in Linux WMs. Things just don't feel like they stick together as much, sometimes the decorations will hang, the menus will disappear, there are blank icons in my notification bar, etc.
It looks great in screenshots, but the feeling is much inferior, a fact I lament.