I didn't have a chance to experience Ubuntu (running Omakub) on my Mac for too long, however one thing I instantly loved is pressing the Super key and it showing your workspaces (like Spaces) — and the ability to type and search for a program instantly here. Far superior to macOS.

Spaces is a big workflow of mine and I am happy this is something I wont have to worry about. More things to discover for "replacement" (like centering windows on a hot key for when you moved them around etc).