Back in the 70s and 80s, we weighed many of these boats. The P16s weighed between 285 and 300 lbs, and the Hobie 16 weighed between 325 and 350 lbs depending on the year, the later years got down to the design weight of 325. The Prindle 18s were pretty consistent at 325-335 lbs.
On the course around here, the P-16s were pretty consistently winning boat for boat around a course, unless Carleton Tucker or Miles Wood or someone at that level was on board. In that case, the P-16 was often as fast or faster upwind and the H-16 (sailed right) would gain the downwind and both would be close at the finish. I considered the two as equals around a course with equal sailors. Each had an optimal wind range/sea state where they were faster.