My god my life is dependent on windows when I fly. Maybe I'll take the train next time.

But to answer your question it would depend on what you are using perl for. If you are going to keep using windows then I would use a windows version. If you want to get real work done then I would use a linux or bsd version.

The main problem with windows is that you have to worry about all its quirks that you would not have in a unix system (including the Mac).