I ran across and interesting article that explains the differences between Dealer glass, OEM glass, OEE glass and aftermarket glass. I am not endorsing this company that posts the differences but the page is quite informative
Auto Glass Article.
Apparently the highest quality are Dealer and OEM glass (but there are some specific differences as the article explains). After that there is OEE glass (which is what safelight and other places may provide). And then the lowest quality is usually aftermarket glass.