Personally I prefer ansible plus I can easily manage multiple machines but this is a little but different use case. I have 5 micro PC like orange pi, Raspberry pi, radxa... so I prefer to bootstrap them from I laptop with a single command in am event of failure

Also everything is running in kubernetes isolation so my OS is immutable and consume much less disk space than NixOS (I don't have too much of it and future is looking bleak in this department)