@valbowman3
Firstly, congratulations on your appointments! What a good problem to have. While I am headed to USNA this summer, I applied to USMMA last year and I have a limited amount of familiarity with respect to Air Force career fields.
Looking at your above desires (Working with aircraft/being involved with military parachuting missions), I would go to the Air Force Academy. Your summer trainings will be based around aviation (Gliders, parachuting, powered flight, etc.) and you have a lot better chance of getting a rated (aircrew...Pilot, Combat Systems Officer, Air Battle Manager, RPA Pilot) slot out of USAFA than USMMA. Historically, just about everyone who was qualified for a pilot slot (medical, conduct, etc.) and desired one was sent to Undergraduate Pilot Training. Even if you are not qualified for pilot come graduation, you still have other career fields that take an active role in aviating. Also, you can select Combat Rescue Officer out of the Academy as well. CRO's are the officer in charge of the Air Force Pararescuemen (known as PJ's) who MEDEVAC casualties from the battlefield. The are part of Air Force Special Operations and their pipeline is tough. Although they do a large part of their work utilizing the HH-60 Pave Hawk, they are still trained in parachuting and utilize it from time to time (depending on mission requirements). In other words, this is the closest thing to paratrooper the USAF and it is pretty close. The only difference is that CRO's and PJ's are on the ground for as long as it takes to get casualties loaded, while Army paratroopers parachute in and then fight.
On to USMMA:
USMMA's main mission is to produce Merchant Marine Officers that serve as licensed deck officers and marine engineers aboard ships of the United States Merchant Marine. The Merchant Marine includes all U.S. flagged ships that are used for commerce (passenger and cargo) and government operations (Military Sealift Command mainly). The U.S. Merchant Marine does not include U.S. Navy warships. U.S. Coast Guard Cutters, or NOAA research ships. All three are uniformed services of the United States while the former two operate under military doctrine as armed services. While there are a multitude of military options available to Midshipmen at Kings Point, none are guaranteed. The only thing guaranteed to you is your license and your commission as a Strategic Sealift Officer in the U.S. Navy Reserve, serving 2 weeks each year. Air Force is by far the most rare of the branches that Midshipmen commission into. Most Air Force slots that I have seen were Air National Guard slots. USMMA is at the mercy of the military for slots. One year, the Navy might need a ton of pilots, so they take everyone who is qualified. The next year, they might have no slots for Kings Point Midshipmen. Also, you shouldn't go to USMMA just for the commissioning opportunities. You should have an interest in shipping and serving in the Merchant Marine more specifically. One year of your four year experience will be spent at sea aboard active U.S. Merchant Marine ships. Slots are too variable to say how good of a chance you have for Active Duty four years from now.
Final thoughts:
USAFA guarantees you an active duty commission in the Air Force, where USMMA only guarantees you a license and a Navy Reserve Commission. USAFA also offers career paths that fit both of your interests. USMMA Midshipmen are somewhat limited in their choices as they are at the mercy of branch manning requirements. You are the only one who can choose as this is your life. However, we are always here to provide advice, support, and points that may not have been considered. Best of luck!