We are interested in slow moving solar powered boats and just want to show that the sailboat shape is not ideal design for our purpose. The 4 floats on the quadmaran are widely spaced and the sailboat is much smaller with much of the floatation in the center. So the sailboat rocks much more in this slow no wind against the sail test. Note that the quadmaran has a lot more area for solar panels as well.
These videos are slowed down by a factor of 4 which would be right if these are models of boats 16 times larger. So imagine the 4 foot quadmaran model is 64 feet long and 32 feet wide.
The wind for this scale is hurricane force, the waves on this scale are large for the Caribbean.