x2 on cruisers RO wm. If we truly go to the Exumas, post covid ,the 40 gph, 240V is the spec. You want to make water while you need the gen for meal time. Noisy, so you want to make a lot.
PO had one on here for the bahamas, and added a 2nd gen. 2 will fit on a 53. 2nd is a 12.5, if you need that kind of redundancy.
On true bluewater sailboats that I have been on, I only saw 2 brands. Both posted already. NL and WB.
A charter operation in West End tortola uses only Northern Lights now. Owner told me that charters run 200 hours per week, and downtime is what matters, not cost. When the gen is down, the boat is down, and that is the REAL cost. They had tried many brands over the years.
Swan sailboats for many years came standard with Westerbeke gen and yanmar power. Those truly cruise the world.