I just interviewed at both Tufts and BU
Tufts has REALLY nice facilities. They were also incredibly more informational and professional about their presentation, and I was impressed with the way everything seems to be well organized, even with their huge class size. It seems like a great school to go to, and it's in an awesome location.
BU did not impress me nearly as much - our student guide was super friendly, but he essentially gave the impression that there aren't very many requirements for the various specialty procedures so I would feel like BU might leave a student less competent than Tufts would. BU is also in a more dirty/dangerous location of Boston and isn't accessible by the subway.
Also consider that Tufts students are said to have a more "uptight" personality, whereas BU students are supposedly pretty social. Is that important to you? The only thing I heard about ortho between the two schools is that "everybody wants to do ortho," so I would recommend thinking about where it would be easier for you to do
well in comparison to your classmates. Both are private schools, so both probably have a diverse and competitive student body. Where do you think you could get better grades? The research position you want?
Maybe you should try to get info on how big each of the grad ortho programs are, at Tufts and BU (postdoc programs typically take 2-5 ppl ish). You know, if you have the BU "vibe" going and its ortho program is bigger, I'm sure you have a better chance of acceptance. Especially if you get to know the faculty in the ortho dept, that's a foot in the door.
Since they both have ortho programs, think about
where you would be happier, where you would fit in better. hope that helps!