The last time I looked at Python 3, Perl still had much better Unicode support. In particular, grapheme support in regexes, built-in casefolding, and easy normalization made a 100+ country project much easier.
The stability of the language, core libraries, and CPAN modules across major releases really helps with maintenance. Python's 2/3 break was a bummer for a lot of people for a long time that I'm glad to have (mostly) avoided.