I have some really nice, hearty chaeto that is full of pods and growing nicely. As for the difference, I went with chaeto because it grows fast, scavenges nutrients efficiently, can be thinned easily and doesn't go into harmful phases....
I would be more than happy to pull off a hunk and give it to you to get things going....let me know, I live in Winter Springs / work in Altamonte Springs, so this is easy....
Mitch