I have an Aliner with a wet bath. The shower is tiny, requiring us to sit on the toilet lid to shower. Still it is better than taking sponge baths. I really like the cassette toilet - wouldn't camp without one. It holds about 3 gallons of waste (about 5-6 days worth for the two of us) and can be easily, cleanly and quickly dumped in your nearest roadside toilet (or dump station) with no messy hose, gloves, etc. giving us lots of waste disposal flexibility.
Wet baths are less convenient. You must dry the shower well before using the toilet, because water left in the bottom is messy, especially if your knee happen to bump a faucet and turn it inadvertently on while on the potty (say in the middle of the night when it's pitch black.)
Wet showers are a little better than nothing, but if you want a camper that has all the amenities of a big one like ours does (King bed, full kitchen with a 3-way fridge/ freezer, microwave, AC, TV, and a toilet/bath) that you can tow with a 4 cylinder car (as we did for over 40,000 miles) then you don't have much choice. Given the choice (the available space) a full-size dry bath is the way to go, but I've seen RV bathrooms with almost as much square footage as my entire camper. In a small camper, I'd rather have a king sized bed to spend the entire night in comfort and a small wet bath, than to have the two of us crammed into an uncomfortable double bed all night just to have a little more room for an occasional 5-10 minute shower when boondocking. We always use the CG shower when one is available - about 1/2 the time for us. If we're boondocking for a couple nights before staying a night or two in a CG with a bath house, we'll just wait till then to soak in a long, luxurious, spacious, hot shower there, saving our propane and limited onboard water supply too.
Chip