I suppose that this sounds odd to you, but I would choose the plattform based on the editor I would prefer to use, cause perl works fine everywhere - but if you have an prefered editor that is limited to one plattform, and it's you're favorite tool for doing coding tasks, use the OS of your favorite editor. If you use vi(m)/emacs to do all your coding, the plattform doesn't matter at all (vim/emacs and perl are working well on all of them).