Just quickly glancing at what you are doing, i say choose the former. You can always determine what URI was passed in:

sub handler {
   my $r = shift;

   my $filename = $r->filename();
   my $uri      = $r->uri();

   ....
}
[download]

From there it's just a matter of mapping to the actual page. I would also subclass the individual "handlers" and just call the appriopriate one based on the URI.

Hope this helps ...