vs.

Catamarans are faster! Say 15%-50% faster than a comparable cruising monohull.
Due to it's draft, the catamaran has a lot more water to use! How's 1.5' - 4'?
The vessel is more stable! Much more than 5 %. heel and something is wrong!
It's safer for quite a few reasons - lack of crew fatigue, unsinkability, etc.!
It's just more fun! Still not convinced? This subject can take books to adequately present but you can click on the following articles that really help understand why we are so thoroughly convinced about multihulls:

Time for respect and Catapaulting to the Future

VS.


Design Considerations for Catamarans - back to top

Multihull Design Considerations for seaworthiness

From the graphs below it is clear that the energy required to roll the cat over is 50% higher than it is for the monohull.