Univ Maryland or Embry Riddle?

I am wondering if anybody has any thoughts about graduate school for a master’s in aerospace engineering. My son is choosing between Embry Riddle, Florida Tech, and maybe Univ Maryland or Penn State. He is still waiting to hear from the last 2. He was rejected from MIT and Stanford. He has a 3.47 GPA from Univ Maryland and 165 quantitative GRE. I like that Embry-Riddle is small so he might get more mentoring. Univ Maryland and Penn State rank higher but I know rankings don’t mean everything.