BB&N vs. Milton Academy vs. Fay School: please advise!

My DS was accepted to the kindergarten program of BB&N, Milton Academy, and Fay School. We are facing hard decision to choose one of these prestigious schools. As my previous post mentioned here:

“We look for a better overall academic education, specifically more opportunities for leadership skills, public speaking, etc. But any comments, experience sharing are welcome!”

Thank you for your advice. We appreciate it!