Monohull vs cat on extended passage?
Having done offshore passages on both monohull and catamaran, I can say that both can be uncomfortable but the downwind rolling motion on the monohull is absent on the catamaran. It is much more comfortable on a catamaran on this point of sail. Also, there is minimal heeling on all points of sail, so this in itself makes passages less tiring. The motion of a catamaran is quicker in a seaway because there is no ballast but one gets used to the motion in a day or so. I do get less seasick on a cat than a mono but only a little less so.