When you want speed, either the v-shaped or the flat-bottom hulls are the best. However, you should know that different hulls have their strong suits, and it comes down to your needs. If you are sailing in lakes and rivers, the flat-bottom will give you the best speed on the smooth waters. For your ocean swells and offshore needs, a deep v-shaped hull is ideal for you. The best hull shape depends on the waters you will encounter.