[CentOS] cfengine vs. puppet

Hello All,

I have been tasked with getting some configuration management system running at work.

We have about 20 web servers running (some virtual and some physical), and we are trying to come up with a tool that will assist setting up new boxes as we bring them online, as well as maintaining existing systems when changes are necessary.

After spending a little bit of time searching around today, I have run across 2 that seem like good options, cfengine and puppet.

Does anyone have any thoughts about either of these tools? Is there definite advantage to using one over the other from your experience? Is there a another tool that I should be evaluating?