The Inflatable Keel does not provide as much Ridigty as the wooden one, thus allowing the floor plates to move. If you do not inflate the keel to the right pressure, the whole boat is subject to more wear, so basically there is(should) be no "dampening" of the keel
Most SIBs don't have much of a V-Keel anyway, though woodkeeled ones tend to have more than inflatable Keeled ones, thus working "better" in rough water.
The wooden Keel is heavier though, my 3.2 SIB weights 50 KGs unladen.
These boats are just SIBs though, they will never rival the rough-water performance of a proper RIB, but should be faster on flat water than a RIB of the same length with the same motorisation.
Searider+Yamaha+Land Rover= :D :D