Chef and Puppet recommendations [closed]

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I'd like to ask about when and in what circumstances you'd use puppet and when you'd use chef. I've also found rump which is a puppet-solo type of thing where you iterate a single server to its configuration and then push that to a series of servers, allowing you to see changes directly.

My question: which of the above should I use and in what ways? Could someone help me?

My aim is in the context of continuous integration, continuous deployment in a mono/.Net environment with rake and git. I would like to package, version and deploy web applications easily and would like to use recepies for a load balancer for multiple web servers. Being able to take these down quickly and not have any downtime in between upgrades.