They're about the same, adds a TOUCH of stiffness.
In looking for the stiffest ones, it seemed to me that WRP makes the stiffest boards. The powdercoating on them actually comes CLOSE to the snow shedding capability of the older fastlane boards. Plastic will always shed the best though.
btw, ANY of them will break or bend with a good hit, but I'd think the fastlanes would likely be the most resistant to breakage from a hut from below?