Best zipper money can buy today or at least I am aware of, is "YKK". Now maybe there are others or was in the past as the U.S. did have the best at one time. I do know they are quality from years of use and this is a 2 fold company, reminds me of Kohler, who does plumbing fixtures and engines, they, YKK also has an architectural product company, I have bought and installed their products, good quality, the kicker is they are a Japanese outfit, but remind me of our good ole U.S. made quality of the past. Kind of like a rice grinder bike, reliable well built, good performance, but some people dislike them because of where they are made.
Most clothing products will have YKK zippers, at least decent quality products, seems they have a good market share.