Perl is a more expressive, "cleverer" language. But I noticed when I moved to Python that I write better code. Too often in Perl I would try something clever and terse, then two days later it would bite me in the bum and cause more problems than it solved.

I would still pull out Perl for some quick bash replacement type script, regular expressions are so much nicer in Perl, but for larger scale long term projects where maintenance is important, I would go for Python.