center sponson good for low speeds inland running.
Allows lowing planing speeds. Better turning and less porpoise
Full tunnel for all out high speed running.
Better rough water-offshore water action. Harder to keep under 30 and more bow steer.
Now this is just my observations. I have a center sponson on mine. ihave only drivin one full tunnel. There are sweet but since I am in MN and boat alot of inland lakes n rivers i needed the low end planing
Alot more expereince here to be had then from me.
Too Old and many others have had several cats of different manufacture and they can better tell you the characteristics.
Mine is great for me
However, if I ever win the power ball it might be a hard choice from a Mares to a Skater