With you driving it around a lot, you might do better with a diesel. When we bought the 2010 F250 Supercrew we had, we bought a V10 gasser. Reason being that it was about $5000 or more cheaper, Diesel gas costs more, and some other routine maintenance was more (but intervals were longer). We didn't drive it much. Camping and then a little here and there. There was not enough reason for us to justify the added cost. If budget is an issue, which was for use, get out the calculator. Crucnh the numbers. Find out the gas mileage of the gasser and the diesel. Make two columns (gas/diesel). Figure out the cost per mile. Figure out how many miles you drive in a year. Figure out the yearly cost per mile...Take the price difference between a gasser and diesel and divide it in the numbers for an average time. 5 years, 7 years, 10 years ( or however long you will have the truck).
You just gotta play with the numbers. As far as pulling, then a diesel will probably give you better power on pulling. Diesel engines generally last longer also, if that matters to you.