The Ross School of Business at U.Michigan is elite caliber, and undoubtedly all of those subjects would be at least as well taught at Michigan as at Tufts… and actually probably better than Tufts.
You will have a wider selection of liberal arts courses at Michigan than at Tufts. In some departments Tufts will be better, but in others UM will be better. This is not a good reason to choose Tufts.