Wondering how the 2021 JP Surf Pro construction compares to the XXX construction of Sunova boards? I've been riding a Sunova for a while and it seems very strong - no paddle marks on the rails for example. Seeing a 2017 ad for a JP which shows paddle marks down the rail (www.seabreeze.com.au/Classifieds/Stand-Up-Paddle-Surfing-and-Cruising-Boards/~48hy5/2017-JP-Australia-Surf-Pro-8-0.aspx?_page=1&search=uQNVTXNc1pWhjfFr%2B0%2FS5w%3D%3D) - has the new JP construction got any stronger in this regard?

Both constructions are sweet. Adding rail tape stops any paddle marks on the rail.

The JP will be lighter for the same size board. I can't confirm for sure, but I feel like they use a lighter foam blank.

I don't like the handles JP use when the board is bigger (as they are too small to carry a long way), but if you can surf 110L or less the handle is fine.

Note that paddle marks are not a symptom of a bad construction.

A good construction is what enables a board to be less prone to breakage in half, leaks around the boxes, basically anything compromising the structural integrity or waterproofness. Plus, a good control of the board flex when pushing hard in turns.

Resistance to paddle marks is a specific feature, but it has a drawback: the added weight for a strong outer layer on the rails. People wanting performance shapes generally know how much better performance-wise is a lighter board is, so manufacturers that make real performance shapes may choose weight saving over aesthetics on their "pro" models. For instance Gong had Kevlar rails at one time, but the added strength was found not worth the extra 400g. (plus it is a nightmare to repair)

As usual great comments from Colas and agree with harder to repair kevlar as in don't grind it and glass one layer of e or s glass .

And as a reference had carbon straighter rocker slalom boards, s glass with carbon kevlar patches and full kevlar wave board.
There is a noticable different flex patterns to board with a straight go fast board and a curvy plan shape and rocker.