I don't care for either; I have used PHP very little and python more often for doing work with data related projects. I am not sure if one is more powerful than the other, but if it's the usual case you choose the best tools for the job, not necessarily which one you think is more powerful.
For example python has a mature and well built library for data manipulation and analysis work, for that reason many of us will use python. However if you're in need of building a website PHP would be your choice. The market is also full of PHP freelancers that could probably help you out as well.
And yes, this site is built on PHP. Most likely what many would call the LAMP stack.
https://builtwith.com/pebhmong.com