NixOS, i was a long time btrfs with snapshots Arch user. But Nix is just more stable and makes my life happy knowing it will always work as a server, desktop, or on a laptop. The config file is easy to read as documentation as code. That can reproduce the setup and even use flakes and home-manager to copy all your dot-files with ease. Just modify the version number in the file to update it and all apps are independent of each other with no weird dependencies. Better rollbacks then btrfs as it uses systemd and you can save git of your configuration files. This is the future