Diesel is better but at a stiff price in initial purchase price, trouble finding a gas station that pumps diesel on backroads and in small towns, added maintenance costs, and problems with bio-diesel and with fuel gelling and water contamination that only happen with diesels.
My diesel truck cost $9,700 more for its diesel engine and Allison transmission over the same truck with a gas engine. For heavy towing the diesel is worth the added expense but it sure as heck is gross overkill for hauling a camper or doing driving around town to go shopping or commute to work.