I'm not sure technora in necessarily stronger that wood. Particularly the wood wave boards are really exceptionally strong. Everything can ding and break, but wood have that extra resiliency to hold up better. So for the wave boards, I think you can safely say wood is stronger that wood carbon. The latter works really well too though, I put mine through some heavy shit at the stone beaches where I sail where you often get you stuff washed up all the way on the rocky beach. No damage yet.
So I have confidence in both constructions, but if you are really worried about getting the strongest possible, get wood.
My guess about the bigger boards kode 86 and up, slalom boards etc) is that the difference might be smaller. Here the wood construction is already a lighter variant than in the smaller boards.