Pro's typically diesel, power and longevity of engine, maybe a little better mpg. Con's diesel! Cost more and cost more to maintain. Oil Change is gallons not quarts. I really thing there are two sub categories of Super C's. There are the one like you are looking at with a Ford or Chevy small truck large van chassis. They you jump to the Freightliner, International durastar Chassis, Nexus, DuraMax Jayco Senaca, sorry if I missed one. These are bigger diesels like a class A diesel pusher, can be a Cummins, Cat or the like. They are animals on pulling a load. Are you towing something?