Diesels add significant cost to the purchase, take hundreds of pounds of payload away, need DEF in addition to fuel and cost more to maintain and repair..... If I'm not towing a horse trailer full of horses I don't see the advantage at all.......
What engine do you prefer ? My old work truck was a 2013 F350 supercab, shortbed,4wd, AT,service bed, probably at gvw ~ 9,000#Ace! said:Stock Super Dutys come with anywhere from ~31" to 35" tires. I have 33" tires on one truck, 2016 F350 6.2L V8 gas (work). I have 34" tires on the other, a 2005 F250 with 6.8L V10 (personal). I think if you're going to have anything over 33" tires, you should get 4.30, IF you're going to use it off road or towing much. I like the torque that the 4.30 provides, but I know it diminishes my mileage when traveling on the Interstate. As long as you know that, then 4.30 could be better for you.
The other thing to consider is tire width. The larger the tire, taller and wider, the heavier and harder to get started turning. Lower gears are obviously better for that. I try to get the narrowest, tallest, tire I can.
So, I guess I'm not really answering your question. For me, I got 4.30 because I knew I'd have at least 33" tires. I would probably even go lower if I could have (stock), but I built my (personal) rig specifically for off road, most people drive a lot more Interstate than I do. I'm literally unconcerned with mileage. The work rig is used for towing 10k lbs. at least once a week, therefore I wanted the 4.30 for in town towing.