These comments are not based upon own experiences but observations and discussions with multi hull owners during our trip.
Their main advantage as of sailing speed is exagurated. They do not go well down wind and have problems uppwind, but with the wind 45 -120 they may be faster. They are in most conditions more stable and calmer in the movement, but in severe conditions may tilt forward! and stays upside down! In adition some have a severe banging from the sea in the deck section between the hulls when going up wind.All multihulls must have escape hatches below deck, and I heard incidents about leakage problems in bad weather. They have lots of space in the deck saloon, but may be more narrow in the below quarters. For island cruising probably ideal, not so sure when it comes to circum navigation. The bigger ones 35+ seems to need at least some 15 knots of wind before they may use their speed potensial. With drafts normally less than 1 M you may anchor or 'park' almost everywhere. And double all the costs except for the sails when it comes to maintainance and harbor fees.
It all comes down to priorities.