I know they cut glare but what are the difference between the different companies? Are cheap polarized sunglasses better than expensive ones? I noticed that Oakley says their polarized are 99% Maui Jim ? Kaenon 99.9% Rudy Project 99.9% Costa Del Mar 100% Does this mean Costa cut 100% glare and are therefore better than the rest? How about how they are polarized? Are some just a film layer and are some actually part of the glass? I am just trying to figure out if one company's polarization is much better than anothers.