This topic is highlighted in the current issue of PaddleNews (Feb 6, 2019).
In terms of construction material the presenter neglected to mention the best kayak option: thermoformed kayaks.
We have been kayaking 14 years (I have canoed for 50+ years) and we have paddled polyethylene, composite and thermoformed kayaks.
This includes kayaking and kayak-camping on the Great Lakes and rivers and lakes in Canada and the US - Ontario and Florida in particular.
Thermoformed kayaks are as rigid as composite and more durable.
For kayaks of similar size and comprable quality the “honest weight” of a well made thermoformed kayak is about the same as a composite and generally costs considerably less.
After tripping in rental kayaks (composites) for two years we were ready to buy and over a long weekend at a very helpful and patient outfitter we test paddled about a dozen different quality kayaks chosen for our intended use with the expectation of buying composite.
Towards the end of the weekend we paddled Delta thermoformed kayaks and after 15 minutes (or less) we were sold.
We paddle the Delta 16 (which Delta classifies as Performance Touring). These boats are stable, fast and handle very well.
Delta Kayaks of B.C. Canada makes excellent thermoformed kayaks to suit a variety of skill levels and needs.
Disclaimer: I have no affiliation with Delta Kayaks other than owning several of their models.