What do i do if my heart says Marine Corps and my Head says Army if my main goal is to be a Delta?

I want to join the Army because one my father is army, two i want to be a delta and special forces is their main recruitment area, and my father is special forces. But my heart keeps saying Marine corps. either its my heart or some other thing inside me that keeps talking to me. no im not schizophrenic. opinions are welcome but reasons backed by facts are prefered.