Python will probably be easier to write and almost certainly be easier to maintain.

It's possible to write good code with PHP, but a great deal of the example code you'll find online is not good. On top of that, the language itself tends to encourage bad design (see "broken window theory").

Python has a strong culture of having one obvious and good way to do things. In some situations, that can feel restrictive, but it tends to make dealing with code other people wrote easier.