They are similar concepts, although I would say that Zodiac are definitely leading on the marketing hype. At least they've got some waves in their video !
As far as I can see they are both very conventional RIBs fitted with big consoles and Ullman suspension seats. They certainly look like great boats, but I can't see that they are quite as revolutionary as they are made out to be.
If anything I would say that the Ribcraft is more "cutting edge" than the Zodiac as it has the full Ullman system including handle bar controls.
Perhaps we could arrange a back to back test