"But I guess a power catamaran without a mast and big sail will be less prone to flip?"
Not really, few even large cats have enough sail area to fly a hull, there not Hoby!
Breaking wave action can toss a cat , especially a heavy one that is IN the water , rather than floating ON the water.
Sure they all float but cats , and tri's will follow the wave surface , rather than allow the wave to build along side .
My experience is with a 45ft Headly Nichol Voyager Tri , run from NYC to Bermuda then to the Carib in 1970's.
A massive amount of work , till we installed an Aries self steering , and the next trip was a 12 day vacation.