Which branch should I join?

I'd like to work in the aviation field (both military and civilian) so I'd have a marketable skill in the civilian world. I will get my MBA while in so hopefully that will help me stay in and hit that 20. I do know that it is harder to get promoted and stay in, under the Air Force if your not a pilot. Army is bigger and getting promoted and staying would be easier.

Yes it is easy to get promoted,but the Army will use you up faster and with what you want to do for a living the Air Force is a better fit