Endeavour is just Arch with an installation wizard and a pretty theme.
Definitely don't use nix or guix as an OS if you're making posts like this. They're great as a supplementary package manager, but extremely difficult and convoluted as an OS.
I've recently switched from Arch to Nobara after running it for a few years. It's really nice being able to update without the fear of something breaking. I'm just using flatpak and guix for the few packages that are missing from the repos, no AUR needed.
Install i3 on top of whatever DE you want, don't look for a specific spin. It's really useful to have tools for stuff like power management. Also, when you break something, you've got a backup.