Strawberry Professional comes with many other modules packaged in addition to the ones mentioned in your replies (for example, the BioPerl suit), Activestate comes with the ability to connect to many repos and has a nice bundle of modules as well.

Going the other side of the discussion, the Win7 side comes in two versions, the 32 bits and the 64 bits, Perl can work in both but I am not sure how it can scale on a 64 system through the Win WOW64 interface/layer since the language distro is mainly a 32-bit which may limit your full exploitation of the precision capacity offered by 64 bits, I can stand to be enlightened cuz I am using Perl on a 64bit Win7 on occasions.

Back to Perl, it is a matter of what is more favorite to you depending on what you do, ActiveState Perl is very cool and the PPM makes installing modules much easier since it can connect to various repos that have prepackaged modules for Win systems and that you can alternate between them, no immediate need to build and compile the module, CPAN on the other hand has many modules of course but some of them rely on Unix-based environments and may not work on Windows hence I prefer connecting through PPM to CPAN to shortlist modules. Strawberry has different tastes and toppings too, go through the following links to gain more insight:

• strawberry vs activestate perl
• http://en.wikipedia.org/wiki/Strawberry_Perl
• http://stackoverflow.com/questions/3365518/should-i-choose-activeperl-or-strawberry-perl-for-windows
• http://stackoverflow.com/questions/71513/which-version-of-perl-should-i-use-on-windows