I would not really call RPM Fusion a PPA - it's basically a repo with packages that are inherent not open source or patent encumbered and can't thus be in regular Fedora repos (and Copr actually). Otherwise the community maintains it to a very similar standard as the regular Fedora repos.

Compared to that Copr is a real PPA where you can build stuff into personal repo (as long as its built from source, licensing is fine & the thing is not patent encumbered).