I had a simple porti-potti in one boat.
I had an RV toilet in one boat
I had a compositing head
in one boat
I had a traditional marine head
in one boat.
I can't say any one was universally the best. Each has their pluses and minuses. How those pluses and minuses balance out will depend on boat, the cruising area, the length of the cruise
, the number of users and personal preferences.
For cruising in the islands where it's convenient and legal
to dump every day, I prefer a traditional marine head
with a gravity fed holding tank. Simply open the through hull
and it drains out. Simply close the through hull
to keep everything in the tank when at anchor
For a small, inexpensive day sailor, where the head will only be used for an emergency
, I prefer a small, inexpensive, simple porti-potti.
I felt the RV-type was the one that provided more of the worst of both worlds, more than the best of both worlds.
For a while, I owned a small trimaran
that I used for relatively short cruises, sometimes on lakes where overboard
discharge was not an option, but could not afford the space or weight of a large holding tank. A composting head was a good solution there.
Again, I think there is no universal best. Different heads are better suited for different situations.