AIRE 136 DD- 146 DD vs R, E and D design

Ok all your round boat folks out there got a few questions and looking for suggestions. what are the real differences in the DD design over the R,E and D design. Looking at adding a round boat to the fleet for extra carrying capacity of passengers and gear over my 14' cat boat (sotar st). Looking to see if the DD is a better ride for rivers in Oregon, Washington and Idaho. Wondering what you all think.

thanks