I find that, given the same width, thinner boards are more comfortable because they are less corky. Corky boards dip down farther and come back up faster.... that creates more correcting adjustments. Lower in the water dampens the wobble, and corrections are less intense.
STC nailed it. This is why at 65kg I am finding a 7'11 , 32 wide , 4 3/4 thick, 130L board corky. It sits high in the water and you bounce around like a cork. If the board was say 8'6 and 4 thick it would be less corky
my starboard 8'8" airborn is 3.75 in thick--vs 4.25 avg for comparable boards.
net effect is that my airborn has less volume than comps, but it's lighter, has naturally sharp rails, yet floats me as well as same sized boards with 20% more volume. thin is in......at least within reason
