The propeller drive is more efficient than fins (if the propeller is large enough in diameter) but the main advantage of the Hobie is they have an inflatable Kayak with fin drive. I haven't found any other pedal powered inflatable yet. Another advantage is you can deflect the fins to either side for minimum draft.
The Native Watercraft Mariner 12.5 Propel Angler Mariner 12.5 Propel Angler
looks nice, but it is going to be harder to stow. I'd really like an inflatable.