What are his likely majors?
Don’t know if you and your son visited career placement centers at both the universities and investigated their intern placement statistics for his intended major(s). Internships play a significant role in the quality & number of job offers after graduation. Look beyond marketing brochures.
Also your son should attend a few freshmen classes at both the places to get a flavor of the educational environment, and where he feels more comfortable.
Professorial Assistantships is a great way to get choice research experience at MSU. He should comparethe choices of research opportunities at U of M. UROP at U of M can be very competitive for hot fields.
Also, as mentioned above, spending an overnight at dorms will help solidify the decision.
If he is aiming for medical school, seek and compare admissions statistics, pre-med counseling and hospital shadowing.
Some academic departments offer their own scholarships in junior/senior year, and worth investigating. Keep in mind the tuition/credit hr for junior/senior level classes is higher than the lower level classes.
Good luck.