I honestly think you'd be fine on either one. Advanced riders can handle the extra length no problem. Any negatives you'd notice in tight turns would contrast with positives during freeride/carving.
Tough to say, for Vermont and Utah I'd want the extra length. For bombing Blue mountain I'd want the extra length. Only time I'd want a shorter board would be a park board or if I was getting something specifically for tight tree riding.
The weight ranges are just a guide, but I prefer to be in the centre of a range as opposed to either end. Especially if you're trying to get a board to step it up a notch. Also are you a fit 120 or just a small person? lol
If you're fit for your weight you could go with a longer board.