Why Croogo? Because it's CakePHP based and it was released when I was at my most frustrated with WordPress. I'm really that easy. I wanted something Cake based so it would be easy to tweak. Plus it uses Cake's theme, which I already know, so I was able to convert the old WordPress theme (with a few updates) in about 5 minutes.
There's a simple three step process to make the switch that, fortunately, involves a plugin called Bye_Wordpress for Croogo that makes moving the contents of your blog a lot simpler. There are a few things to watch out for including database encodings, spam protection and there's a bit of code he includes to show how to map your old URLs to their new locations.