Well I don't think there is a "best" or "right" UI. It's pretty much very vague and subjective. There are _some_ guidelines and some ways of doing things, just because people are used to some things that have been established. It's not universal and not an exact science.
With the tablets we have the opportunity to invent some truly unique and new UIs because in itself it's a unique and new platform. We don't have to stick with desktop paradigms and things that make sense outside of the tablets.

We don't have all the information to make a democratic poll. If everyone would get the new device and test in real life situations the various proposed UIs for a period of time, only then could we make an informed voting.