I run WordPress-Multisite for several sites. Each of these sites resolve under a single domain, e.g. example.com/foo/, example.com/bar/. I also have domain names for these e.g. foo.com, bar.com which are currently redirects, so if a user hits foo.com, they are redirected (301) to example.com/foo/.
My question is, should it be the other way around? Should I use the dedicated domain names directly? What are the pros/cons of putting multiple sites under a single domain vs their own dedicated domains?
I guess I'm asking with SEO and findability in mind.