Comparing Boardworks TEC and Surftech Tufflite construction methods.
In my experience, the PVC sandwich construction method has the best strength to weight ratio and longevity. The outer shell with the high density foam sandwich is significantly stronger and less likely to leak that other construction methods using a regular glass/ epoxy layup on EPS foam. You can visit these pages to compare the construction process:
For a good rundown of different construction methods written by the Board Lady, visit: