Interesting that you should post this, because I am also struggling to solve the dilemma of Where The Heck To Post Fic. I have a separate LJ for fic, and I'm trying to decide whether I want to mirror it at DW or just crosspost everything to my main LJ and my main DW. (While I appreciate the AO3 archive and have an account, I don't really use it.)

My sticking point is that stuff posted to LJ generally gets more comments. Me/comments = OTP. On the other hand, I also don't feel so comfortable leaving my content on LJ.

In short, I have no answers, but I can at least sympathize!