I'd vote for Yamaha from experience. Also from seeing the number of Honda
outboards piled up across the Pacific in many places. Most were said to be
under warranty and most were fixable but they all had to be sent back to the
factory. Yamaha allowed the repairs, if needed, to be done at the local
dealers. The cost of sending them in (you pay one way they pay return) from
out there was prohibitive. Easier to spend a few dollars more to begin with
and buy something that lasted better and could be warranty repaired locally.
Also Honda did not have the equivalent of the T-Series or work engines as
does Yamaha. They advertise a wide range of speed for all needs. What that
means to the guy in the commercial fishing small boat or with a sailboat is
a huge waste of power band at the upper speeds. Honda tried to be
everything to everybody in one engine. Yamaha just provided something that
worked. As for two strokes .. .the biggest market in the world is slowly
but surely banning them. Yamaha saw the writing on the wall.

MST