After hopping around MacOS window managers, I landed on Aerospace. For MacOS it's by far the best, and can do most of the things I want.

But it still feels like a plastic fork and knife compared to Niri. Really wish Apple would open up more of their desktop APIs..

Does anybody have experience comparing it with Yabai?

I only tried out Yabai once I discovered AeroSpace in order to compare. I immediately appreciated AeroSpace's take on just completely sidestepping MacOS spaces.