I've owned several types of dinghy and messed about in many other's small craft. Despite all their advantages and popularity I HATE inflatables because when the motor dies you can NOT row them home unless it is the most favorable of conditions.
I don't think people talk about this failing enough, but I can tell you that when you can't paddle against 1.5-2kts of current and you find yourself getting swept out to sea and away from your boat, it makes you think.
I really like the looks of the Kaboat. I've also liked the looks of the portaboat though it's one of the few craft I've never used I would take note of how fanatical the owners of them are. Most all of them LOVE the boat. I've also seen them rowing well.
We had a lot of conflicting needs, but we ended up with the best compromise we could find. We wanted stable (for small kids), rowable, sailable, able to mount a small OB and most of all abusable. We also were attracted to the "proactive liferaft" component of our choice, the Portland Pudgy.
We love it! (they're not cheap new, but they pop up on craigslist for a few hundred dollars pretty often)
Portland Pudgy safety dinghy, inflatable boat, or fiberglass dinghy?