>>859400The main benefit for both E and EX is that they're well-supported. The site's been around for 13+ years and survived multiple takedown attempts, it has a community of experienced degenerates, a lot of scanlation groups upload directly there as a primary source, and if you have ExLinks installed it'll show you the gallery info even without an account.
That being said, if someone's looking for source of a page/crop and not just doujin recommendations, I'll always give the title rather than a link so that they can go read it on whatever their preferred site is. It's easier for everyone.