I had the spaghetti mat on my star, and where she was sitting on the pads she formed blisters from the stuff. I've had no issues after switching to the floor mat.
With the weight of the boat, the spaghetti compresses and is basically flat. This allow moisture to stay inside of the little holes caused by the materials, with no way out. I;ve found that the mat actually "wicks" most of the moisture away.