Cassette toilet vs porta potty

Look into it but I think the cassettes are vented. If not then I'd go with the porta potty. We have a porta potty since I remodeled our bathroom and it works fine. Got one with a 5 gal tank so it sits at a comfortable height. The only problem I've had is when gaining a lot of elevation the air in the tank expands and since it's not vented.... I learned quickly that I need to leave the gate valve cracked ;-) No problems since. That was a 5000 foot elevation gain. We are both very happy with the remodel. There is far more space than before and more storage which is critical for us. We boondock almost exclusively and we have an enclosure for the outside shower with is far better than the old cramped thing before. Emptying the potty tank is actually less trouble than the black tank was, there is no concern of buildup or blocked outlets and I can quickly rinse it clean in any outhouse or bathroom.