I agree with everything stated above. In addition, your budget and mode of transportation come into play.
In my opinion, Kayaks are better than a pontoon. To me, pontoons seem like a lot more work to get to the water and then a lot more work on the water. Saying this, I have never owned one so take this with a grain of salt.
If you have a truck and large budget... you might put something like a Twin Troller into the mix. It's not a paddler, it operates with two in-hull electric motors. On paper, the Twin Troller looks like a great little one-man boat. Some of the guys and gals in the "Pond Boats and Float Tubes" forum might be able to give you some feedback on it.