The nacra 450 - 14'-10" long and has an 8' beam
The hobie wave is 13' long and has a 7' beam
seams to me two adults would do better on the nacra
but hey what do I know
By the same logic, if you can safely sail with 4 people on a Wave, you should be fine with 6 people on an A-Cat - after all, A Cats are 18' x 7.5', while Waves are only 13' x 7'.