<ol>
<li><p>Happiness depends on the individual. Just because more people are happy at one place, doesn’t mean you’re guaranteed to be happy there. For example, I’d probably be “happier” at Duke since I can’t stand the cold, but other people might find more contentment in Dartmouth’s beautiful rural campus/skiing opportunities.</p></li>
<li><p>None is more prestigious than the other two. This should not be a factor in your decision.</p></li>
<li><p>Dartmouth is the most Greek of the three, whereas Duke and Cornell are roughly equal. But Duke, I guess, does have the sports thing going on for it.</p></li>
</ol>