There are many things to consider so it is hard to answer the question out of context but a couple of thoughts and questions for you to consider:
1) Will HBS or Stanford offer you something you can't get at Booth? For example - do you want to work in Silicon Valley? If so, it makes more sense to go to Stanford
2) What are your post MBA goals? If you plan to strive for a high paying career such as I-Banking it may not matter. However if you plan to focus in General Management, Marketing, or even Consulting - those loans will take a long time to pay off. Not having the loans gives you more flexibility down the road to take chances: join a startup, take a chance on an interesting company that doesn't pay as well, start your own business, etc. This is all much harder to do when loans are hanging over your head for ten or twenty years
3) IMO - I would choose a top ten school over a second tier school with scholarship but I wouldn't turn down a scholarship from a top ten school for HBS / GBS. All ten schools have fantastic brand names, an amazing network, and recruiters from every company you can imagine. While there is definitely an aura and a pedigree that comes with HBS / GBS there aren't necessarily a significant number of concrete advantages.
Finally - visit the schools and see where you feel most at home. Some people turn down HBS for Booth or Columbia because they want a specific experience that only these schools can offer. Each school has a defined persona. Yes - HBS / GSB are generally considered the top two schools but that doesn't mean they will necessarily give you a leg up. You need to think about what school is right for you and for what you want to do.
Pamela Jaffe
MBA Admissions Consultant
The JAffe Advantage