Ram 6.4/4.10 dually vs 2016 Ford 6.2/3.73 dually

I had a 2015 F350 dually 6.2 gasser with 4.30 gears, I'm towing a 14,000 lb 5er. What a mistake. It was woefully under powered when driving on any slight hill grades. It required driving with my foot on the floor board shifting using the manual shifter button. I traded it in for a 2012 F350 6.7 diesel dually which tows my rig with no problem. Go with a diesel if you need to pull any kind of weight.