The key highlight for me is the new “drop zones” functionality, which looks a lot like the Windows PowerToys’ FancyZones feature I have come to rely on.
I’ve been using BetterSnapTool solely for replicating FancyZones, so adding that feature to Moom makes upgrading a no-brainer for me.
On my laptop, I’ve been using AeroSpace instead–because, well, sometimes keyboard-driven, i3-style tiling is just more efficient–but I’ll certainly give it a try there as well.
If you want to check out more alternatives, I have an entire page devoted to window managers.
Update: Version 4.1 (which ManyTricks kindly provided me with beta access to) is now out, and allows for shift-dragging a window to a Drop Zone just like FancyZones on Windows, which covers 80% of the stuff I do reflexively (the other 20% is “painting” across zones with a dragged window and snapping to the union of those zones, which I can do without).