We were in this same predicament a year ago. After much research
and thinking, we decided on the Tohatsu 18hp.
We didn't buy it though because of a snafu at the dealer - where magically, their warehouse was broken into the night before we were to pick it up and only our engine
was stolen. They could have another the following week, but there was a significant "price increase" just that day and they couldn't sell it for the same price as our "stolen" one. Ah well.
We told them to pound dirt and bought a Suzuki 20hp 4-stroke instead. Very happy with that.
Everyone here will insist you must have the Enduro because it is a magical engine that has heaps of spare parts
and sublime mechanics waiting for it everywhere you go, but I think that Tohatsu 18hp is a very good engine and a better all-round deal - and I have found Tohatsu dealers/parts everywhere in the Caribe.
One of the reasons we were going for the Tohatsu was the alternator
start, which we wanted. You cannot get either for the Enduro.
All in all, you probably can't go wrong with either engine.