Care to explain? Xonsh is a python shell. From a cursory look at the very corporate Ansible website and wikipedia it's

"an open-source software provisioning, configuration management, and application-deployment tool enabling infrastructure as code"

Whatever that means. They seem to do very different things as far as I can tell.

No new syntax, unless you want to write scripts in xonsh, or mix bash and Python in the same command. There's rarely any reason to. 99/100 times I just write pure bash or pure python