This post hit very close to home. I am an incoming(VERY Marine motivated) plebe who was lucky enough to attend both SLE and NASS this past summer. To say I had two very different experiences would be an understatement.
For me, SLE provided insight into what combat arms culture was like and I loved it. My squad was incredibly close and we still are in touch. Some of my closest friends to this day are people I met at SLE. Most of all though, I fell in love with the culture of selfless service that our Cadre created.
NASS was a different experience. I did not get to spend any where near as much time with my squad and we were hence not as close. The culture was less "motivated", and certainly could feel "watered down" at times. (I will say I greatly enjoyed when Stew Smith made an appearance for PEP. I was fanboying throughout the whole workout. If your son does not consider death by pushups to be a good workout as a rising senior, I applaud his physical fitness level.) Despite all that I did not lose interest in USNA. Why? The relationships I formed with those detailing NASS. The best way I can explain it is that it felt as if I had finally found my people. Those relationships I created with all of the Midshipmen I got to talk to are what helped keep USNA and USMA on an equal level of interest in my mind despite having had an overall less positive experience at NASS compared to SLE.
A few months later, I was incredibly fortunate to have overnight visits at both academies. It was then that I had the clear realization that USNA was the place for me. The culture of selfless service that I loved at SLE? I got to experience it during my CVW. The Mids I interacted with from a new class? I felt that same bond with them as I felt with those I had previously met. I would also like to be clear(at the risk of being slightly confusing) that I greatly enjoyed my overnight visit as USMA and am very grateful to all the Cadets that had taken me under their wing. However, as I got to see first hand the cultures of USMA and USNA and juxtapose them, I came to some additional(private) realizations as to why USNA was the clear path for me(in terms of quality of life). This previous statement is NOT me saying that one academy seemed easier than the other. Lastly(and most importantly), it is imperative to look at what opportunities are beyond the academy. I was able to realize that despite being Marine motivated, there was not a single service assignment option offered at the Naval Academy that did not interest me.
In sum, I greatly preferred USMA's summer program over USNA's despite preferring the Naval Academy over West Point. Both academies(from my perspective) are very different from their respective summer programs. Keep that in mind and keep an open mind. End of the day, both schools are amazing places to end up. Best of luck to your son as he continues this process. I hope he is able to get something out of my post.
After having read my post over again, I feel an obligation to sign off showing some of my USNA pride.
Go Navy, Beat Army!