The hull is the main part of a boat that rests in the water. It is usually made of fiber glass.
fiberclass
aluminnuim
The hull on a boat is the body of it. It is watertight so that no water leaks in and sinks the boat.
On the hull
Displacement: The weight of the water the boat displaces. Hull weight: The weight of the hull of the boat
the hull helps keep the boat stable, if there was no hull, the boat would go in different directions
I am assuming this is a sail boat, ski boat (jet boat). If the boat is made by a manufacturer the the hull will be strong enough. If the boat was made privately, the hull would be laid with plywood, then fiberglassed as a sealant strengthener. If you have an outboard motor on the transom, this must be well supported by "bungs" (which are the two pads at the back of the trailer. Most of the weight should be on the center-line (keel of the boat) and the rest should also be supported by the rollers.
A hull is the watertight body of a ship or boat. Above the hull is the superstructure and/or deckhouse, where present. The line where the hull meets the water surface is called the waterline.
The hull of a boat is the main body that rides in the water. Engines, Decks, masts and rudders are all installed in or on the hull.
Basically, the hull on a boat keeps out the water, and displaces the water to create buoyancy, which enables the boat to float.
ANSWER: One is made for flatwater only. The other, the v-hull is made for larger bodies of water where waves occur. The vee shape cuts throught the waves better than a flat bottomed front of the boat.