As a keyboard user, I feel Windows more polished than macOS when you work with multiple screens.
To name a simple example, pressing CMD + Shift + -> moves an application to the next monitor, with macOS you should pay for a window manager to get a similar functionality, or give up the keyboard and embrace a touchpad-centric gimmick like Expose, which I perceive as distracting with these animations.
It is certainly an example of YMMV.
Spectacle is free and does this and a lot more should you need it.
Ah, multi-monitor support. I always joke how I ditched hardware random-number generators because the window placement of macOS is a superior source of randomness.
Meanwhile, multi-monitor support in Plasma 5 has worked for me for years without any trouble whatsoever.
Well, it was buggy until not very long ago:
* https://bugs.kde.org/show_bug.cgi?id=365455
* https://blog.martin-graesslin.com/blog/2016/07/multi-screen-...
This also was rather annoying and took a long time for distros to catch up: https://bugreports.qt.io/browse/QTBUG-42985
Since Plasma 5.8.x, it's much much better.
BTW, Windows 10 is slightly better, but not by much. The major difference being that one can predictably get a signal on both monitors, I guess, which is good, but then the HiDPI story is still pretty bad.