Ubuntu
As a web devloper you tend to wear a lot of hats. In this case it is a Linux admin – and I use that term very very loosely. It was always about installing the latest version of Ubuntu and once it was installed sitting there and going “now what” and then I was format and install windows.
In my current job, all the web servers were running on Windows with IIS. While this isn’t necessarily bad, it’s very limiting and for things like mod-rewrite just not happening. So I convinced them to let me at least run Apache on windows which was great, but then I got greedy.