Both were or are great but somewhere along the lines they hopped on the express train to crazy town Alan Moore with Lost Girls a Porn comic about classic Fairy tale characters like Alice and Dorthy and if I'm not mistaken with sleeping beauty and Frank Miller with the legendary line I'M THE GODDAMN BATMAN!!!! who is more crazy you be the judge
I think it goes without saying that Alan Moore is crazier.
" @The Angry Comic Book Critic said:Is this the place where I say "Dark Knight Returns ain't that great"?" @FadeToBlackBolt: Save for Frank miller's run of Daredevil and Sin City those were pretty good stories "True. As were the Dark Knight Returns and Year One. "
Because it really isn't.
Frank Miller is a special case. His works tend to vary from downright stupid to simply inspired. On the other hand, I don't recall Alan Moore ever doing anything else but good stuff.
Its hard to deny it though that Moore is crazy, but crazy in an ideal way when it comes to writers...
Moore is a very smart man with interests in what are generally considered fringe politics and spirituality. That doesn't make you crazy, just specialized in your interests. Miller is a man of at best average intelligence who for some unknown reason hates women and brown people. That usually isn't considered "crazy" in America, but it does make you dangerous.