My diagnosis after seeing WritersCo a little:
WritersCo is superior to Elftown on two grounds. One thing Elftown lacked (that is supplemented by Elfwood, but that's a forgotten site on Elftown) is a place to showcase your works. WritersCo has a confusing Superwiki section that ought to be very good for this purpose, once I figure it out exactly. Second, WritersCo is hardly populated, and I know lots of people on here. It seems much more friendly when there are only fifty people here, and they are all approved of by someone else. It kind of ensures that members know how to capitalize sentences, which is somewhat of an eyesore on Elftown.
Oh, and the sidebars and images pwn Elftowns :D (Though I do kind of miss Elftown's buttons. These are a bit plain.)

o.O A blog. I like the term diary better. Though I suppose it doesn't matter. So [SilverFire] dragged me here. I'm not much of a writer, but maybe this site'll change that. It looks nicer than Elftown. Though the light blue might be a bit too bright. I don't know how I'll be able to manage both sites. Being on two ET's is twice as time-consuming as one :P