Given that we can use the written, static presentation, or video formats in our supplemental essay, it does seem to me that a presentation would combine the best of both worlds - the ability to reveal new aspects to your personality through pictures and text. The video option would have ROCKED, except for the 1 minute limit - frankly, its just time enough to focus on one point (maybe touch upon two?). Anything more, and its like jamming information down the viewer's throat.
On the other hand, the slide presentation can be viewed at the AdCom member's pace - as a viewer, I know I'd enjoy it more if I could take my own time viewing an essay, and not have to play it multiple times to get what the applicant is trying to convey...