Stability, or Why Your Mother-in-Law Votes Catamaran
This is the underrated row in the table - and where the "most people get it wrong" part really lives.
A monohull under sail heels 15-20 degrees. It's exhilarating, it's what sailing posters are about - and it means your glass slides, your soup relocates, and moving around the boat becomes a gripping sport. Many guests love it by day three. Some never do, and a queasy stomach is the single fastest way to turn a dream week into a countdown.
A catamaran sails almost flat. Drinks stay put, grandparents walk the deck without a handrail strategy, and - we say this from hundreds of preference sheets - the wine-glass test has ended more charter arguments than any broker ever could: put a full glass on the table underway. On the cat, it's still there at the anchorage.
One honest footnote: cats have their own motion quirk - a quicker, snappier shuffle in short chop - and monohulls actually roll less violently downwind. But for the average first-time Caribbean week, the stability crown belongs to the two-hulled team.