In my opinion, the "best" JUCO is one where your son will have an opportunity to play early -- for a coach with integrity....where he will have a chance to improve, while exploring the possibility that he can play at a higher level....at an institute that will prepare him to succeed as a student. Oh -- were you asking about win/loss record?
Let's face it, there are pros and cons to attending a JUCO ------ a different subject, I'm sure.
My son played at a D1 JUCO for 2 years. He had a coach that loved the game and worked his arse off to improve the field, the reputation of the program, the quality of the experience, etc. Before I list the "but" -- I understand that an 18 yr old's motivation is impacted by many things. Ok...but...the academic program at the JUCO was not very "rigorous" -- he cruised through with 3.4+, then found a "new world" of higher education as a junior at a 4-year school. He is doing fine...but others really struggle with the adjustment.
Will I encourage my younger son to consider the JUCO path? --- ummmmm, I dunno.
Sorry to stray from your intended discussion.
-PD