I have not even picked up my Diesel pusher yet.
But, I know some of Diesels and have done some homework.
Diesels will have more resale. Not many V10 RV'S with 100000 miles out there.
Diesels CAN have better interiors because of weight.
Diesels WILL have a better chassis.
Diesels fuel will not go bad. It will get algee in it and the cetane will go down over time, but it will start if the fuel system is air tight.
Diesels WILL pull much better over all and better MPG.
I am at the lower level of Diesel Pushers, but in my opion, I would buy a diesel 3 to 4 years older from a gas for the same money.
BTY, Do you know what the inventor , Diesel, based the fuel of the diesel motor on? Vegetable oils. If you are using a pre 1998 motor, you can use WVO, TRASN FLUID, MOTOR OIL, .....almost any oil to run you rig. The newer ones uses injectors and pumps that have a hard time with the thicker fuel, but heater will help that too.