I've used an Outcast Fat Cat for the last few years. The sit back into it chair is nice, as is the larger supportive size, but it's still basically a tube. The larger pontoons that allow the use of oars is a huge step up IMO. You ride higher out of the water, and have the ability to row to your destination MUCH faster than you can kick. You're also safe from the threat of wind. A strong wind (made worse by a higher profile) can make for harder rowing, but it can be Game Over with a kick-only tube. BTDT.
Mostly depends on budget, size of water fished, and how much you think you'll use it, and how much garage space you've got. I've gotten by with my Fat Cat, but mostly wished I had a 'toon the whole time.
