[capta]

I went from a 65' gaff ketch built in 1909 to a Brown Searunner 37' tri, while circumnavigating.
I found the Searunner to be the ultimate cruising vessel if you are willing to abide by the rules of a real sailing multihull. A multihull that will sail must be kept light. No SCUBA tanks, excessive spares, air conditioning or even what a monohull sailor would consider a reasonable amount of fresh water.
If not, then you have two choices; travel with at least one engine on at almost all times or get a monohull. Most of the room-a rans here in he West Indies do not sail between the islands; if they are honest with you, they motorsail at best. If you want all the mod-cons, SCUBA tanks and a zillion gallons of fuel, AND sail, then you're going to need a monohull.
It all comes down to what you want from your boat.

 

[capta]

I have to respectfully disagree with capta.
On our Lagoon 440 we had 4 aircon, two scuba tanks and all the gear, 240gal water and watermaker, 170gal fuel, 20hp 4stroke outboard etc etc.
Only time sailing was tough was with winds less than 10kts, and once over 12 we would routinely outperform our Moody 46. At 16-18kt and AWA 110-65 we would do 10-12kts all day and with our Parasailor in winds 20-30 we comfortably sailed downwind 13-14kts day and night.
Galapagos to Marquesas without pushing in 17days!
Our friends on their Catana 47 also fully loaded with goodies would sail even 30% faster than us and could sail well in light air

Well, then you must have the ONLY Lagoon that can actually sail to windward. Any vessel can sail down wind, even a raft! I was speaking of a "sailing" multihull; that means sailing on all points of sail, not just off the wind. A 1200 mile beat up the Red Sea will certainly separate the sailboats from the floating condos.
Not to say there are not cats that sail, but they must be kept light, just like a tri, since they can't spill wind by heeling, they must accelerate and bring the apparent wind forward, or lose sails, the rig or flip.