Going to Harvard is great. But going to Cornell/Columbia is equally great.
It's just how you take advantage of what the school has to offer. There's just so many variables to consider.
Ignoring for the moment that I'm waitlisted by Columbia and have a vested interest in your fiancee going elsewhere...
🙄
I wouldn't say that going to Cornell/Columbia is equally great to going to Harvard. All three are top schools, but Harvard is arguably the best in the country (people will argue about Hopkins, UCSF, etc.). Poke around SDN for a while and you'll hear people in the allo and residency forums using (often unconsciously) HMS grads' placements as the gold standard for whatever is a desirable residency/fellowship position.
Graduates from Cornell and Columbia do well, but there is a difference when compared to HMS if you take an aggregate viewpoint. Is it due to the Harvard name, or the intrinsic abilities of the students admitted to HMS? Who knows... there's no definitive answer.
What most everyone would admit: Harvard has better hospitals (taken AS A WHOLE, not with regards to specific specialties), more money, more accomplished faculty, a sick alumni list, true pass/fail, and a sterling reputation.
Columbia has Bard Hall, Washington Heights, honors/pass/fail starting second year, and Lee Bollinger [personal note: I am fine with all of these
😀]. Cornell has heavy PBL (though HMS NP has some, as well), honors/pass/fail all four years, and a Gossip Girl location.
There's always Fung-Wah and Greyhound... You and your fiancee have an important choice to make. Remember what Spiderman's uncle said: With great power comes great responsibility.