I took another look at this thread and even scanned over all of the responses. We have lots of opinions but I am not sure I really understand the advantages and disadvantages of the two types of bathrooms.
I have a wet bath which I like. It takes up less space than the dry baths I have seen so in effect for the same sized camper I get a nice sized wardrobe closet instead. Even for those who do not need that storage or extra space, I am puzzled about the wet bath advantages. The dry baths seem to be very cramped on both the toilet and shower areas so I just don't see any significant advantages.
I would be interested to hear, not just opinions, but some actual reasons that explain why many people prefer the dry baths.