Hey man,
I thought of some things you might want consider especially if you are considering a career in either service. I am no expert, so I am sure someone will correct me, but these are some anecdotal observations I've made (both good and bad).
If you are a live to fly kinda guy and thats more or less what you care about (I don't mean for that to sound negatively either) I would consider Air Force. The Navy has such a variety of assets to put money into and aviation is just one of those. The Air Force has tons of money to put into flight hours. The same thing goes for the Army. I have "heard" that a lot of their warrant officers have 4000+ hours.
With the Navy, while it is possible to stay in the cockpit most of your career, you most likely at some point will be doing things not in the cockpit. With the AF, not only could you probably take flying billets your entire career, you can transition from platform to platform with no career consequences. I.E., fly C-17s at one point, then go onto fly C-130s. In the Navy, you generally stay within your community.
Also, there are some missions you will train for (this is from the helicopter perspective) in the Navy that will most likely go to the Army or AF before you. For instance, Combat Search and Rescue or something involving Spec Ops. However, with the Armed Helo mission developing now, you might see the Navy taking bigger part in this arena.
On the other hand, I can hands down say you will have more opportunities to develop yourself as an officer and a leader in the Navy compared to the AF. Just because of the fact that you will have challenging ground jobs in addition to your flying duties as well as taking billets that don't involve flying---you will develop into a stronger leader. In my opinion, the AF puts a much smaller emphasis on command. Go onto an AF base, and you will find 6+ O-6s walking around, each with a different job. The AF will have an O-6 that is in charge of MWR and hospitality, while in the Navy, you will find a LT or LCDR manning that position.
In my few years in NROTC, I saw more places in the world then several AF friends I had that were already commissioned. I know that will probably remain the same as I continue with my career.
Again, these were just anecdotal observations I have had. I am sure there are rebuttals and counter arguments but I hope I could help.
(apologies for any grammar or syntax mistakes, feeling tired this morning)