Rolling release; entire config stored in git, allowing for reproduceable setup - I can get a new machine the exact same state in 30 minutes with a few KB in config. Super easy rollback if I break something. Never wondering if something is gonna break with an update. Never wasting time trying to figure out how I set something up before, because it's explicitly declared in config. Standard config language for everything across the system. Ability to roll your own OS in any shape you like. Much easier package creation than RPM or debs. Decentralized composable config - you can pull from many git repos to build your system. Ability to have multiple versions of packages and libs installed at once. Immutable file system except for home folder and a few other paths. Ability to set up temporary dev environments and package installs.

With every change I make, the system only gets more stable, predictable, and reliable, which is the exact opposite of every Linux distribution I've ever user before, which had to be wiped and reinstalled every couple years, after which I'd have endless struggle sessions getting everything set up. I'll never go back.