It’s also worth investigating the style of singing that’s emphasized in a given program. For example, at Northwestern kids can audition for the MT Certificate from either the Theatre or Vocal Performance majors. While you might assume the VP majors would get stronger vocal training, it is my impression that the emphasis of that program is more on classical singing, so more working MTs actually come from the Theatre major.
I agree with @halflokum that it’s tricky to compare emphasis across programs, but I suspect most kids in a school have a sense of the relative emphasis on the 3 different areas in their own program. For example, I’d guess many students at NU might say Acting, Singing then Dance at Northwestern, although their curriculum is extremely flexible so that may vary from student-to-student (and many VERY strong dancers graduate every year).