Not even as a gift, Peg? Come on.
The object is to keep poop out of the water
The dry head
way is simple, if a little on the crude/unpleasant side. Takes far less space, and is as simple as Forrest Gump. The most you can spill is "sterile" urine.
The wet head
? Well, you're the expert.
But from a small boat pov, and the continuing maintenance
necessity, the wet head = more space, hassle, and expense.
As a personal reminder to me, I saw the scene described above on a pumpout. I won't describe it as a courtesy to our kindler, gentler readers.