Very simple and objective reply. MIT is huge Rockefeller tiny. If you take the Nobel Prizes received by each as of now both have 20 Nobel Prizes (genuine). Thus quality per person Rockefeller is much greater also admissions tougher since Rockefeller is tiny thus has less openings. MIT is extensive and good in many disciplines, and also has undergraduate programs, Rockefeller has only graduate studies that too mainly related to Bio and Medical Sciences.