[charliesome]

Everything does the job, it just depends how quickly and easily you can get that job done.

[pseudonym]

Right, and under the category of easily: What languages do you already know, What languages are you already actually comfortable using for a large scale project, and What is the production server running.

If the answer to all of the above is PHP, then you're going to get projects done faster there than you would in Python or Ruby.