Join the Cat Crowd
There's no shortage of good reasons to climb aboard a catamaran
More cruiserly craft tend to have longer bridgedecks, as mentioned above, plus larger and squarer superstructures and simpler rigs. If you don't want to hassle with daggerboards and will be content with less spectacular performance, go with fixed keels; depending on where you cruise, you can take advantage of their shallow draft when seeking isolated anchorages or pulling up near a beach.
If you're a wind-in-the-face sailor, you might prefer dual helm stations out on the sterns over the more common position at the deckhouse bulkhead. Nautitech and Catana favor this approach, while Lagoon, on its larger models, has a flybridge, removing boathandling operations from the cockpit completely.
One of the most talked-about dimensions on catamarans, and one that you don't often find in the published literature, is the wingdeck clearance--the height of the wingdeck or bridgedeck above the water. Slamming in a seaway can make offshore passages noisy and uncomfortable, and while factors like bow buoyancy and the shape of the tunnel also come into play, high wingdeck clearance is the single surest way to reduce the number of impacts in a given sea state. In boats intended for high-speed offshore voyaging, designers aim for as high a clearance as possible in keeping with goals for low weight and windage. Height isn't so critical in boats intended for cruising in coastal or sheltered waters.
By making observations from the dock, you can get an idea of which boats might satisfy your sailing needs. Only then should you venture aboard--where you'll surely be seduced by the sumptuous saloons.