Ansible is US-owned. Even though it's open source, Redhat, a US company, is the one that controls its lifecycle.

NixOS is based out of the EU.

I mean they sort of serve different purposes. You can build a NixOS ISO running your exact desired configuration that is good to go immediately upon install. Ansible would require post install configuration, yes it is scripted but it is additional overhead and time. I think a better alternative would be an OCI based distro with a Packer build pipeline, which could include Ansible steps higher up in the build process. But that's more complexity that Nix wouldn't require

i used ansible some years ago and i'm using nixos currently and you can not compare those two.

i was not fluent in ansible and i'm not fluent in nixos. yes you have to leave your comfort zone for nixos, but your get so so much more.

the jinja templates in yaml feel like a big hack if you used nixos.

would really be interesting to hear someone talk who is comfortable to use both of them.

It's close, but Ansible is often not deterministic.