What should I choose between Veterinary Corp, Warrant Officer Pilot, or Medical Corp? Which is best for Army NG or Reserves?

Hard to respond to this question without more details; where are you in the process of recruitment? What are your existing qualifications (do you have any degrees/training relevant to any of these fields)? What interests you in each of these? What do you hope to get out of your experience in the Army? These potential options are quite divergent to say the least.

Well in the Guard or Reserves what is available in your area within a reasonable drive, how far are you willing to drive for a position etc. I know in my area one would have to drive to Nashville about 2 hours for medical, Ft. Knox for Warrant officer Pilot about 65 minutes and I have no idea as fara veterinary officer. Most major units have a reserve recruiter at the recruiting station and a retention NCO at the reserve building if it is large enough that could help tell you what is available and most Guard units have a recruiter as well.

Son you are all over the map.