I maintain some software, and Nix is by far the hardest to deal with. To package config files are relatively complex, and to submit a package you have to download the entire Nix repo, which is huge. Getting a package to build correctly can be a challenge.
It's a pretty large ask for software contributors, who may have to iteract with a half dozen different distros. Now, you could say, leave it to the distro people to do the packaging, but it remains a barrier for entry and is by nature exclusive.
I don't use NixOS, so I have little motivation to stay conversant with Nix and, frankly, it's so demanding I don't bother anymore. I can make RPM, deb, and aur packages trivially, and without having to hold Gb of some package repo (which I otherwise don't use) on my disk.
Arch. Or, rather EndeavourOS. I've lived with several distros (daily driver desktops, laptops, servers) for years: debian, Ubuntu, Gobo, gentoo, Redhat, CentOS, Arch, Artix, and EndeavourOS. Redhat was my least favorite, and EndeavourOS probably my most.
I'm currently running Endeavour on my desktop, Artix on my laptop, and vanilla Arch on several servers and ancillary devices. All of the Arches are basically the same day-to-day, except Artix; Artix is the lightest, but also the most work, and I probably wouldn't choose it again.
I like Arch because - for me - it's been stable and pain-free from dependency-hell, of which Redhat distros were the worst. I will not go back to any point release distro - rolling release has been so much better for me. The Arch wiki is the best source of Linux information on the internet, and the AUR has almost everything in it, and is easy to contribute to. PKGBUILDs are easy to write; it's hardly any more work to put one together to install something and have it managed by the package manager, than to not.
I'm interested in playing more with some of the source-based distros like void, alpine, tinycore, venom, and kiss; my experience with gentoo leads me to believe I won't be happy with any as daily drivers.
However, I'm very interested in Chimera.