I purchased the 9'6WAA i did look into the 10'6waa but decided on the smaller board because of recomendations.
Bit then i live next to the beach and my flat water work will consist of 10 percent at most.
I feel after much investigation you should go the same road and get the 9'6waa
Same stability in both boards but the shorter will surf better
Im 85kgs of pure kiwi sheep shagging expert at all master of none

I ride PSH to make me a better person