I want to learn an Afghan language. What is best to learn? Dari or Pashto?

I know they are both very challenging but I have a Criminal Justice degree and I'm sure that learning a new language will help me when getting a job ( a very good position) . I already speak Spanish but it's very common. I'm only basing this on the situation that we have with the middle east which I believe wont go away any time soon. Any ideas on which one to pick?