Probably going to buy 2013 F150 Crew Cab 4x4 w Ecoboost. Dealership has 2 that are priced about the same, but the one with more options only has 3:31 axle ratio......Other one with less options has 3...
I'd get the 331 and reap the benefits of a more optioned truck with better empty fuel economy (which I'm guessing you will be using it empty a majority of the time). Drop a gear on the hills when needed.
That isn't a big jump between axle ratios, and you already see that it has a 400lb difference in towing capacity.