Perl will be easier to learn on linux. It runs better on linux, you can install modules easier on linux, linux comes with a free c compiler, which makes installing xs-based modules very easy.
Tk will look and run better on linux. Gtk-perl will run better on linux. So I would say linux.
I'm not really a human, but I play one on earth.
flash japh
Comment on Re: Effect of OS Platform choice for learning and doing Perl well
I'm a real true Linux believer, however I must say this isn't true. I'd used Perl on Linux, IRIX, Solaris, Mac OS X and Windows and it doesn't make much of a difference, really. OK, Windows generally sucks, but Open Perl IDE is really good, and ActiveState Perl is OK.
So my advice is : go with Unix (Linux and OS X included). Stick with windows only if you have to.