<p>agree with swingtime- you are really splitting hairs for ‘prestige’ at this level, by course (though Oxford is typically a bit ahead of Columbia in engineering rankings) or university. Both will give you all the opportunities you could want- and (this is one of those truisms that students hate!) it really will be down to what you make of the opportunities at either place. Also agree with swingtime on the benefits of a liberal arts background, esp. given that you want to do business > engineering. </p>
<p>I think you are looking for a proxy for making the decision, but rather than looking for external validation (imo) you will do better to look harder at yourself, and which environment you are more likely to thrive in (not least, it will contribute to getting the marks to get into that MBA program).</p>