I think the Cummins 6.7 is best diesel engine available in the 3/4 and 1 ton market. However, I use my truck as a daily driver so throw in short trips, regens, 12qt oil changes and $100 fuel filters, I decided to go gas. We tow light (6500#) and we tow 8-10 times a year. We were pushing 1800# in payload in 1500 so with growing kids and a trip to New England we decided to make the change to a 3/4 truck. I drove a megacab 6.4 w 3.73 and was underwhelmed, perhaps spoiled by the 5.7 w 3.92 . Also the 2019-2020 Ram 2500 crew cabs use the 4th gen 1500 cab which is noticeably smaller than the comparable Ford or GM HD cabs.
1500 ecodiesels have less payload capacity than my 5.7 Big Horn. So that was a no go.
I can field questions, since I feel like a Ram mole, about the 7.3. Thank goodness that premium fuel at Costco yesterday was $1.75 per gal., showing about 13mpg on a green engine coming home yesterday. Now if gas prices can stay that way for the next 4 years