Having read everything in this thread, may I say, many good points.
Should i ever have to ditch my trike, i would be expecting a very rough landing and be prepared to release seatbelts immediately.
I have read in Jim Davis PPL book p 444 - survival at sea "ditching" that GA ditching survival rate is 88%.
Obviously, GA airplanes are very different from trikes and cross water far more often than trikes and therefore can develop statistics...
Having said that,
I have a passion for amphibious planes....
There are quite a few attempts to transform trikes into amphibs.... Or build purpose built amphibious trikes (cygnet for example seems to work just fine)
I am planning on flying over and landing on still water in my x series trike in the future - It will have floats that turn it into an amphibious plane... I hope I never need to attempt a water landing without floats...
My CFI says all trikes with floats SINK! So, that doesn't encourage me at all.
That could be a case that the best floats are still yet to be made - or that trikes are just more unstable on water than other amphibious planes.
I guess I'm heading off topic now, so I'll stop.
Regards
Mark