Even though Cosmology and astrophysics are pretty much the same thing, still there are some differences. Cosmology is like more mathematical, more theoretical. If you are a cosmologist you can apply ideas from String Theory or so. But if Astrophysics is more "experimental". I mean, obviously there is Theoretical Astrophysics, but, to say something, there is too theoretical biology (and I think biology is 80% observational/experimental). What do you guys think is better?