Rigid standard kayaks: too big & awkward
Klepper folding kayak: these are actually pretty good, but it's questionable whether you could assemble on board - better to dinghy
it to shore and assemble there.
Sea Eagle inflatable: cheap
, and you get what you pay for.
Advanced Elements inflatible: it works, it doesn't track really well, and is pretty slow, but it works.
Oru folding kayaks: these are amazing. Fast, light, track well, fold to a size you can keep on board, and you can actually assemble them on a the crowded foredeck of even a 30 ft boat
. Expensive though; not as expensive as the Kleppers, but not cheap either.
The only functional shortfall of the Oru is that on all but their cheapest / shortest model the cockpits are a little tricky to get into if you are tall and don't fold too well yourself. Their cheapest model this is not a problem though, but it's also not as fast nor does it track as well as their more expensive models. Despite that, it's still head
and shoulders above the inflatables we've tried.