I know you can basically turn arch into catchy, but I see no reason to when there is a pre made distro.
As for Nix, I think it looks very interesting but I very much love arch for my desktop and am not really looking for a replacement at the moment, but it is number one on my list for the future if things change
Cachyos.
Used to use pure arch but I like the cachy optimisations and their repos
You can put Cachyos tweaks kernels and repos on top of arch or nixos if you like.
I know you can basically turn arch into catchy, but I see no reason to when there is a pre made distro.
As for Nix, I think it looks very interesting but I very much love arch for my desktop and am not really looking for a replacement at the moment, but it is number one on my list for the future if things change