On p.r.c, sverrejoh asked Why do you prefer Perl the language over Python the language? My completely subjective and personal answer for me and me alone there seemed worthwhile to repost.
I find Perl much more expressive. Perhaps it's that as I've watched Python develop, I've seen more and more of the Python best practices converge toward a single development style (heavy on Pythonic OO), where Perl has deliberate support for custom individual or shop styles.
I don't think it's bad that Python tends toward a single and identifiable Pythonic style; it's very much within the language philosophy.
I don't think it's necessarily good to encourage multiple paradigms in a language or platform. It's useful if they integrate well.
I like Perl because I think it has sufficient expressiveness and abstraction while supporting different development paradigms (functional, imperative, several types of object-oriented) without forcing any one and making the others feel unnatural (whether technically or culturally). When I write Perl, I feel like I get to choose the most appropriate style of development. When I write Python, I feel like the language and libraries suggest very strongly that my code conform to their ideas.
That's pretty subject, I admit--and I also admit that there's plenty of code on the CPAN that enforces certain styles. Sometimes that's for good reasons (SAX processing) and other times it isn't.
I suppose I feel similarly about Mac OS X versus GNU/Linux.