I don't think that they overall differ so much wrt strength. It's weight vs price. If you're really picky you can feel a slightly nicer flex in the Wood boards too, but that really subtle.
While a lighter board will not automatically be faster, most people will agree a lighter board just feels nicer to sail. The feel of a light board under your feet induces a certain attitude where you want to sail actively and work the board to get the most out of it. But if money is an issue (when is it not?) you will be fine on the technora model too.