The kid's all time favorite toilets are the ones in the Tokoyo Narita Airport. We had a 8 hour layover there once and I really thought the kids were going to dehydrate themselves going to the bathroom every 10 minutes. Turns out they were just playing with the toilets and the cool turbo handryers. What's so great about a toilet? Well these had a heated seats, built-in bidets with warm water, I think I remember a blowdryer, and sound effects. There was no little silver flush handle, instead there was a control panel with lots of little buttons, in Japanese. The boys were in toilet heaven. It took care of at least an hour of that layover.
Personally I like the self cleaning toilets in Germany. When you flush the seat suddenly starts rotating through a cleaner. Each person using the toilet gets a freshly cleaned seat. No more worrying if someone "sprinkled while they tinkled." Ingenious. I can think of a few dozen bathrooms along I10 that could use this feature!
I am pretty sure that everyone's least favorite toilets are the "squatters" so named because you must assume a squatting position in order to use it. Lord have mercy if you have bad knees, are pregnant, or for some other reason you can't squat down and get back up with out loosing your balance or having to touch the wall. I have yet to be in a squatter toilet that I would willingly touch any surface.
If you should have to use a squatter my son's advice is just to take off your pants rather than risk having them touch the puddle of....nastiness that's invariably on the floor of squatters. Carefully take off your pants and hang them around your neck, one less thing to worry about.
I have managed so far to avoid having much contact with African public toilets. I plan to keep it that way. That bit about skipping the second cup of coffee? Vital! Also no matter how quick the trip is supposed to be I go right before I leave the house, you never know what might happen. There are a few western style toilets in Lilongwe I will use in a pinch but they do tend to smell, and I try hard not touch anything in the bathrooms, ever. Mom thank you for forcing me to "hover" over public toilets, who knew that would become such valuable skill?
When we went to Zambia the boys had to use the bathroom at the border crossing while we were dealing with paperwork. Dakota took the little ones. He came back and reported that the urinal was a long trench in the ground deeper than he was tall. The younger boys added in details about bugs, flies, and smells that I could have lived without. He reassured me that he held onto his brothers while they went so they wouldn't fall in. GAH! I decided then and there that I could hold it until we reached camp in a few hours, and possibly until we returned to our house in a week, depending on the conditions at the camp. Thankfully the toilets at camp were fine, a bit buggy at night, but otherwise not bad. At least I didn't have to hold it for a week. Small blessings!
I've had occasion to use a composting toilet on a reasonably regular basis as I take gardening classes at the Nature's Gift Permaculture Center. It doesn't smell like I thought it would. That's a good thing! They keep a bucket of wood shavings and a bucket of ash next to the toilet and there are instructions posted in English and Chichewa to put a little bit of the shavings into the toilet after each "deposit" and a little ash it if it starts to smell. It seems to work, and it doesn't use any water, a HUGE consideration in an area where water is such a precious commodity. If I had a cabin waaaayy off in the woods on the side of a mountain somewhere, a composting toilet might be an viable option. Maybe.