V boat, belly boat, u boat....I have tried them all. While the V is better than the belly I have recently switched to a pontoon boat and will not look back. This opens up more water to me as I can drift down many rivers on my pontoon, mount a motor if need be, hold position by using flippers (like a tube) and I sit all the way out of the water. Also changing flies and landing fish is much easier.
The only issue with the pontoon boat is transportation. I have a small car so I have to deflate the pontoons and re inflate them once at my destination. If you have a roof rack then you have no issues.
I bought mine used for a couple hundred bucks which is about the same price as the Fish Cat 4.
Note: I still like to occasionally pull out the V and float around on some of the smaller urban lakes but on a larger lake you will likely be wishing you had a pontoon.