Dahon Vybe D7 vs SUV D6

Hello

Here is what I can see. Did I miss any?

Vybe: 7 speed, alloy frame, vertical dropout SUV D6: 6 speed, hi-ten steel frame, track dropout (rear horizontal), $75 cheaper, 8 pounds heavier

3 questions 1. Which bike is better, unmodified? Why? 2. For changing to IGH, which bike is...