Puppet, cfengine or something else?

I have been digging through my back catalog of studiosysadmins emails and I found the "cool tools for unix" thread from mid 2012.

I thought I would ask what people are using now and why? We are starting to evaluate CFEngine because a colleague of mine decided on that. I am not convinced that this is necessarily the best choice.

We have approximately 400 odd clients, though I would image with the 4-6 domains we have spread around we would have a master config server at each domain so I am not overly concerned about loading down one box with 400 clients.

I have read the reports from the CFEngine employee who showed that puppet stressed the CPU of the master (after 100 clients) far more than CFEngine.