As far as the AF converting to a Navy NSS is concerned, there is no simple answer.
I am currently in the T-6A
at Moody and have been asking around as much as possible. The latest word that I have found is that only our flights count (no Sims, Academics, Popularity Rating (AF Thing), and Check rides are worth this same as a normal flight). That being said the AF grades on a slightly different mentality. They want to see a progression on grades from day one through the finish, so at the start of each block you are UNABLE to do everything (go figure).
They then take your daily flight scores (from the 66 flights we get) and compare them to the last 60 people (AF and Navy) to graduate from this base (or Vance as the case may be) and see how you stack up. If you are #30 out of the 60 people you get a 50 NSS.
As far as everything else with the AF, it is not that bad, yeah you have to be here longer everyday, but you have to study, so you end up knowing the plane better (I have seen the results of Vance training in the fleet, on the boat and it DOES make a difference). You get more hours here (around 90) and you don't have to do intermediate (coming out of Moody).
The T-6 is awesome, blows the T-34 and the T-37 out of the water. Total glass cockpit, full EFIS system, G-suit, Full Oxygen, pressurized cockpit, the list goes on... take it if you can get it.