The way I see it, there are but a few reasons why a Super-C should be considered over a standard C.
- You need the length, storage, towing, & weight capability of a diesel pusher class-A, but must have the extra sleeping accomodations for more people
- You have a passion for diesel trucks and enjoy the driving & ownership experience of them.
If neither apply, then stick with the standard gasoline cut-away van-style C, most popular the E450 with V10 engine. In the long run, the cheaper one with be going standard.
Personally I could never imagine owning a Super C. The large rental box trucks I have driven were all a very bad experience, and Super Cs are based off the same chassis. If I needed to go bigger, a DP would be my focus.