CW comes very close to my perceptions of the right balance of factors in multis.
For ocean cruising, IMHO, very fit, light well built tris are best 30-40 feet. Cramped, but seaworthy and fast. Over 40 feet cats come into their own with sufficient above wave height but not too high profile. It's very hard to execute a cat like this under 40 feet.
Above 50', choose cat or tri, depending on your preferences.
(All the opinions of one with 25,000 ocean miles, mostly on our 48' steel cutter!)
Since so much of ocean sailing is in very light air, a slippery low drag tri would be very nice. Also easier to adapt storm tactics than a cat. And some distance from the main hull for collision damage, and easier to adapt to 180* living inverted!
That said, the room and trade wind speed of a 50'+ strong light low narrow hulled cat.....sigh.
And "condo cats" like PDGs and geminis don't count, they are inland coastal motor sailors IMHO.
Um, would the 58' cat (with narrow hulls) & 29' beam we're building do it for ya? And stop sighing--get over here to do some glassing instead. The exterior is done, but we have the interior to do, plus the (wing) mast & the rigging, install the engines, sew the sails (Sailrite)....oh, geez, I don't even want to think about it.
We looked at Chris White, even talked to Chris White, and looked and talked to a ton of other designers. We liked a bit here, a bit there, but not one had exactly what we wanted or would design what we wanted, but wanted us to take one of their designs, take it or leave it. So my hubby designed our cat to our specs. It'll have two main berths--forward of the salon, and two heads, one in each hull (it's our home, not a charter boat--you know, the kind with four cabins and four heads and the galley on the bridgedeck because there's no space for it elsewhere). The galley's in the port hull, the engines in the starboard hull (hubby's using hydraulics)...two wind generators, solar panels, we're toying with a built-in solar water heater. Oh, and a small forward cockpit, plus an interior steering/nav station. I know it's pretty and all, but we're not having any brightwork. If I wanted to spend my life varnishing, I'd have taken it up as a career. As for docking, I hate being at a dock. What are anchors for anyway?