Hmmmm.... yeah George they all do have "stronger model" in their range but that means it is a bit stronger by their standards..... it doesn't mean that particular model is strong
compared to other brands Also, a quality mono sail is stronger than a quality X-ply ....... mono comes in different thicknesses and the gluing and stitching is important. You can feel the differences in thickness when you put them side by side.
What Leech says has merit: many people pick Ezzy, which may have a tiny bit less range or may not feel as nice, because they last so long.
Howeevr, I do think a lot of Ezzy knockers may have tried them and not rigged them right: they set very differently to most sails. If you ahve been on NP for years and try an Ezzy of course it will feel wrong ... and
vice versa!
PS: Leech, I was a number 2 person - but with Simmer. They are bl00dy strong but my style of sailing suits another brand. That particular brand has the luff sleeve wear out with holes in it in 3 seasons (if not 2 seasons

) but it feels nicer to me. On the Simmers I have hammered the sh!t out of them for 4 seasons and they are still fine. Rigged almost exclusively in gravel carparks, smashed by very hollow waves, landed on them with the harness hook over and over again, and as a heavyweight I always rig them overpowered.
Do I pick the cheaper sail that lasts forever, or the one that is 15% more expensive and will last for 20% LESS time. Hmmmmm.
Its the feel, its the vibe, its Mabo, its everything.