I know this is a ruby forum but thought I would ask ehre since Ruby doesnt seem as popular as PHP.

From what I read one my of my favorite web apps Basecamp is developed with Ruby On Rails.. so I'm trying to decide if I want to learn this or PHP.. can anyone give me an idea on why someone would pick one over the other? I notice how fast and responsive Basecamp is.. not sure if thats because of how it was developed or something else.. but was just curious what some of you thought here