You will hate Ansible if you are coming from Nix. I went the other way and Nix is 1000x cleaner.

Being able to actually reverse changes is trivial in Nix, but can be a headache in Ansible. Not to mention the advantages of writing in an actual language and not yaml full of template hacks. I personally don’t see much future for tools like Ansible, there is considerable inertia working in its favor right now and it is absolutely true that it is widely used, but the future of configuration management is for sure more aligned with how Nix works.