I had a 2017 f-250 diesel and test drove a 2021 f-250 with the 7.3 and 4.30 gears and I would buy the 7.3. I really liked my diesel but that 7.3 had plenty of power and the fuel mpg on the screen showed within 1 mpg to my diesel.
I really like diesels but unless the truck is making you money...