The great thing is, you can model using which ever method suites you, because you can always convert to a different type once you're done modeling. The nurbs to poly can even createa single shell mesh with version 6 or higher.
Play with them all and I bet you'll find you favor one, but there will be certain things that are just easier to do with one type or another. So you should have some familiarity with all three.
"If you love your job, you'll never work another day in your life."