What are the differences between the Co-op Cycles DRT 1.2 and the 2.1?

@REI-JohnJ I just ordered the DRT 1.2, but almost pulled trigger on 2.1. I was a little concerned about the lesser gears for "highway cruising"....REI has the 1.2 on back order...any opinion on whether I should upgrade to 2.1? I am 50 and new to mountain biking although I am not a slouch rider...