<p>Duke is the one school of the bunch I know next to nothing about. I would venture to guess the differences might come down to size (of school, classes). One is southern, one northern, one with frats, one without. You really should try and visit! I can say from experience (2 kids), that Williams was terrific for my kids— and 2 kids in two fantastic grad programs from there-- and they were both (only) good but not top students. It was for them a great lively experience. Hard work, great friends, totally non competitive, supportive environment. Two “cons” to consider are the small size/remoteness and cold winters!</p>