It's a wee bit hard to say without knowing more about the positions and your past experience, but my first thought is: take whichever JOB is better. Meaning whichever appeals to you most for it's own reasons (leaving aside the MBA). It is true that leadership is the most highly prized of MBA qualities so you can consider that, but whatever you take it IS good, and I think that it won't make all that much of a difference one way or another to your chances. What is more important is that whatever you DO ultimately choose, should be the post where you can succeed more at, and move up quicker with.
Hope this helps you out, dude!
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