Compare drive more than one brand. Fast Lane trucks recently did a you tube video of 2017 f150 10 speed 3.5 vs the Ram Ecodiesel sorry I can't seem to link it but it's any easy quick search with the picture being both red trucks nose to nose with a white enclosed trailer between behind them.
70 mph 98 mile two way loop towing 7K. The Ram got almost 50 percent better towing economy ie 13.3 vs 9.1 for the Ford. Fuel was 30 cents a gallon more for the Ford since Ford recommended premium for towing as would be prudent for a gas turbo. Ford builds a great truck just food for thought as I said drive them both & more. BTW since you can now get 17 EDs the prices on a used Crew Cab 14 ED should be competitive.