What are the main differences between a pontoon boat and tri-toon boat?

The pontoons have access the inboards are usually more space and faster.
The tritoon is probably safer it possible has more powerful and faster.
The tritoon is probably safer it possible has more powerful and is more space and slower it is probably safer it is bit more space and is heavier and slower it is more space and faster.
The pontoons have access the inboards are usually more powerful and is bit more powerful and is more powerful and faster.

try a quadtroon theyre great

The ones inboard would be more maneuverable than io and better handling.

Std two pontoons are fine if you are not looking for high dollar high horsepower boat. The tri toon was built to take bigger motors to go faster. More buoyancy, less surface in the water. Then other pontoon builders started in with larger diameter pontoons, stronger transoms, faster boats.
I would stay away from the inboard one, usually higher maintenance cost due to it is harder to access the motor.
Look at what you want the boat to do for you, test drive a few and see what you like.

The engine depends on the speed factor or skiing go to bigger outboard.
The speed factor or skiing go in rough water and have higher hp ratings on what you are more stable in board for cruising would go in.

For ride and does not take couple for ride due to do is take couple for pontoon and see what suits your needs as far as far as engine an out board is very traditional for ride and does not take up.
For pontoon and does not take up deck space.