The coated scratch far less easily, and tend to hold up better than the non-coated. I have both. That said, the non coated can be polished to remove very light scratches or hazing, which occurs more frequently in non-coated shields. Both have held up pretty well for me without polishing, but I never clean a dry shield (always cover with a wet cloth to loosen up bugs/dirt for a bit before cleaning), and I never ever use paper products on a shield, or any other plastic I want to see through. Only microfiber or 100% cotton. So, for my OEM touring screen (made by National Cycle, maybe?), I'll run it until it gets jacked up and replace it. For my cee bailey barn door, which I love for winter riding, I'll novus it as necessary. I would expect the harder shield (Yamaha) to chip more easily, but it is the softer cee bailey that has a few small gravel divots. The Yamaha still looks great after beaucoup miles. Good luck with your screen.