I had to use Nix in a project of mine and was surprised at how clunky it felt compared to guix. Writing packages meant string concatenations and juggling outputs to the command line.
Same here. I used NixOS as my desktop operating system for a few months I think. It did not go great. After hopping a to a few other distros, now I've been using Guix as my OS for a few years.
I prefer guix. Every day of the week.