Things that I noticed when I had a look at it: Atom supports multiple authors, RSS doesn't. Some say just separate them with commas, but readers don't understan

Things that I noticed when I had a look at it: Atom supports multiple authors, RSS doesn't. Some say just separate them with commas, but readers don't understand that and it's all broken. Also Atom supports archive links for pagination to older entries. Some use the atom namespace inside of RSS to use archive links. No idea if there are feed readers that don't support Atom, but do support Atom tags inside of RSS.