My catamaran is a little smaller, at about 23', but I think that most of the pros and cons would apply. I should also note that mine has a planing hull, so things might be a little different if you are looking at displacement or semi-displacement designs.
1. Cats are a little more sensitive to weight distribution, especially aft. I have the anti-cavitaion plate mounted hydrofoils on mine, which help a lot with getting up on plane.
2. Mine doesn't run especially well in a sea off the aft quarter, because the leading bow will dig into the wave trough.
3. Although they are very stable at rest, the reaction to waves is a little different. I have had people get sick on my boat who claim that they have never been seasick before.
4. They don't lean into turns. I can't imagine one actually flipping, but the motion can be a little unsettling until you're used to it.
5. Less below decks space.
6. Can be difficult to track straight when trolling, because both motors must be at the same rpm or the boat will veer slightly.
1. More room for the same length, because the bow is squared off.
2. Excellent dive platforms, especially if you put a transom door and dive ladder between the motors.
3. Run very well into head seas. I can usually cruise side by side with mono-hulls 50% longer.
4. Very stable at rest. Several people gathered on one side is no problem.
5. Stability at slow speed, and their ability to knife through a slight chop, makes them excellent platforms for side scan sonar.
6. Amazing close quarters maneuverability. I can put one outboard in forward, the other in reverse, and turn in my own radius like a tugboat. This is especially useful if I want to fish without dropping anchor because I can easily hold station around a marker buoy.
7. No noticeable "planing point". A monohull wants to run slow, or get up on plane, but a cat can run at almost any speed. This is particularly usefull when I get caught in rough seas. If I can't get up to cruising speed (around 24kts), then I can throttle back and run 15-16 kts. Most monohulls can't run at that "in between" speed.
Hope this helps.
Tin Man - University of Alabama class of 1992