I'd personally prefer to be with the stronger pool. Would learn more and have a better network.
I agree. I went to Stern and many of the students were BRILLIANT (much much much smarter than I am). I cannot imagine the Harvard, Booth, Sloan, Columbia, Stanford, Wharton students.
It is a great experience to be with a bunch of really smart people who take the academics seriously. You will have a much better experience when you do the group projects and case studies. But you will also have a lot more competition in terms of class ranking.
Stronger pool will help you to learn more IMO.