Im in need of a large truck. I have a midsize and it cant take the abuse or carry much more then a yard and a half. I like the crew cab because I can bring workers. Has a nicer flatbed and headache rack. I dont like the gas mileage and extra weight. I like the reg cab because its a dually. Should get better gas mileage. New exhaust. I think its the heavier duty chassis frame. Its slightly cheaper. It looks a little more beat up and is a further drive to look at. I realize neither will get great gas but 3-5 mpg through the year is a major difference. Neither is 4wd which is almost a deal breaker to me since I cant plow. A 1996 f350 crew cab flatbed. 2wd 7.5L Gas 460. A 1996 f350 reg cab flatbed dually. 2wd 5.8 gas.