Hello PelkyAgain - my D's decision was based on opportunities available to her at NU that she did not find collectively at any other university or MT BFA program.
NU offered the best of everything in what was important to her... A smaller university with strong and challeging academics, a top notch and respected SoC Theater program, the ability and encourgement to explore and double major or minor in other areas of interest (even outside of the arts), flexibility in what classes she wanted to take and when, a MT certificate program

, internship program opportunities in and around Chicago, and access to Chicago's performing arts and cultural center.
She wanted smaller class sizes in academics and a great faculty to student ratio. She preferred the quarter system as well. She was also drawn to a BA program where she would have the option to pursue a Masters or MFA in the future. Our understanding is that a MT BFA is a terminal degree, and if at some point she wanted to pursue an unrelated degree or advanced degree, she would pretty much have to start at the beginning again.
Again, these were issues important and specific to my D. She absolutely loves to perform on stage and to be part of musical theater productions, but she also wanted to be exposed to and delve into other areas in academics and the arts which is possible, and again encouraged, at NU.
MT BFA programs are great, especially for those who are MT Broadway driven and know that is exactly what they want to pursue. Excellent universities and conservatories offer highly structured and specific BFA curriculum tracks with the goal to get their students working professionally in MT all around the country, if not on Broadway, right after graduation. For many, the MT BFA fits their aspirations perfectly.
How wonderful that your S has two acceptances already. He is obviously very talented and will have a variety of offers to consider. Have faith that come April (if not sooner) he will have all the information he needs to make his best college and program choice.
I hope this helps at least a little. I wish for you and your S the very best over the next several months.