If your son is even interested in looking at alternate, low-pressure yeshivas, that is a VERY good thing. Go with it and show him you respect his choices.
Don’t worry about “the types of kids who go there.” your son is already one of those types or will be soon enough. Give him the environment he needs to thrive.
I would have him dorm, however. It will take a lot of the daily pressure off of you. Is there an option like the second school you mentioned that offers dorming?