The problem with a question like this, responses will be all over the place.
For us, when DS went through the decision making process between colleges (all of them were hosts), we took him to the dets., and asked to meet some 400's after meeting with the CoC. We did this because just like colleges, dets have a personality.
I agree from the point that they will all cover the same type of materials and training, but people are different.
I think this does come in part from the college feel too, but again some dets are much closer than other dets. Some have weekly social time where cadets all love going to, some have this where you can hear crickets chirp.
This can be just as important as the college choice, it maybe that like our DS it is the make or break. After DS met with some 400's and talked to them one on one (we were not there---on purpose), he liked the cadets he met at one college more than anything he expected. He walked out and asked Bullet to take him to the Bursars to pay the deposit. He did not visit anymore dets after that. We couldn't even convince him to do another visit to another college. As parents we were hoping he would visit at least the other ones where he had merit scholarships (had merit to the one he went to with AFROTC scholarship).
If your child is torn between colleges, make an apptmt to visit and meet some cadets. Leave them to meet alone so they can just hang. DS and the cadets played Xbox in the lounge while they talked about AFROTC. It was just 4 kids being 4 kids.