NixOS, package availability is comparable to Arch with the AUR. Arch has a total of about 80-90 thousand packages (That is, the regular repos + the AUR), and NixOS has over 80,000 packages in its own repos, that are actually maintained, and are more up to date than Arch (meanwhile, Arch often has a bunch of outdated and unmaintained packages in the AUR, such as all the Waybar packages that haven’t been touched since April (there was a new release in June).
NixOS, package availability is comparable to Arch with the AUR. Arch has a total of about 80-90 thousand packages (That is, the regular repos + the AUR), and NixOS has over 80,000 packages in its own repos, that are actually maintained, and are more up to date than Arch (meanwhile, Arch often has a bunch of outdated and unmaintained packages in the AUR, such as all the Waybar packages that haven’t been touched since April (there was a new release in June).