If I had a "do over" and was buying new I would actually seriously consider the cassette toilet over the traditional setup. My van has the normal black tank with a 10 gal capacity. I can tell you the black tank is very maintenance intensive, difficult to keep clean and smelling decent. Now the gate valve on mine is leaking and needs to be replaced.
The cassette does require more frequent dumping but it's a lot easier than having to get a FHU site or find a dump station, hook up hoses, flush the tank. I have even seen people tow the cassette tank behind a car, take it to a dump station, dump it, and hose it out to get any sludge out.
The only concern I would have is if you plan on doing a lot of boondocking. Then you would probably want the extra capacity of a traditional setup.
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