I've been recommending and using Puppet and Chef for years. However, the new generation of tools like Ansible and Salt are miles ahead in terms of usability. A

I've been recommending and using Puppet and Chef for years. However, the new generation of tools like Ansible and Salt are miles ahead in terms of usability. Ansible in particular makes it easy to be up and going in a matter of minutes where some of the other tools literally take days. So, if you're on the fence, I'd try Ansible first, then if for some reason it's not working for you, then consider Chef.