While some might call one a hull and the other something else, both of these boards have more similarities than differences. Bottom, rail contour, tail and fin characteristics define those similarities. The plan shapes are obviously different, but then the boards are designed uniquely for different types of waves. As a side note, I'll mention that the fins are hand laid with particular materials and shaped and foiled to specific dimensions and are an integral part of the dynamic performance of this type of wave interface. At some point I will publish a diatribe on my fins. Thanks for looking! TB