I also believe either of those gassers will work for you. With the higher horsepowers and torques of newer engines and the 8 and 10 speed transmissions they are far more capable than just a few years ago.
And you were apparently unlucky on the Ford. Except for a bad high exhaust temp sensor (replaced under warranty) my 2012 F350 6.7 with 75,800 miles has been great. But once burned, it is hard to forgive and forget. I get regular emails from my dealer with coupons for $89.95 diesel oil change and $9.95 gasser oil change for DWs Expedition. Significant cost difference. And diesel fuel filter changes are nothing to sneeze at either. Plus adding DEF. And two batteries when time for replacement. Plus the initial $6,000 or so for the diesel. Some good economic reasons for a gasser.
