<p>Cambridge will offer you a more specialized, in-depth education in math properly. If you are however unsure about your major and/or would like to take other classes outside the math department, you should go to MIT.</p>
<p>Keep in mind that, if you choose Cambridge, you will learn nothing but math for 3 or 4 years (with a little bit of theoretical physics also thrown in as part of the “applied math” papers).</p>