On the Hurricane Software website they've done a comparison between PHP and Python judging them based on things like feature set, community and documentation.
What does it take to state one language better than other? One answer can be flexibility, development friendly, licensing policy (open source or commercial), community, portability, dynamic typing, support for variable number of function arguments and ability to freeze live objects in a string representation. Documentation of course is a major player when you choose a language because you still have to sharpen your skill and you haven't worked on that particular language yet.
They go through a list of the prominent features of each language as well as some basic benchmarks for mathematical operations like finding primes below 10000 and looping with a bit of calculation. They compare the two languages' speed of execution, speed of writing, ease of setup and portability.
You can also listen to the report via the in-page player.