I use ywriter! I like it a lot, because I can add different scenes to my chapters and put it from my characters' points of view (and write a bunch about each character). And there's a lot more to it that I haven't used/tried yet.

I don't move my Prep assignments anywhere else, I just go back to them for reference. (You could probably add Prep assignment notes to ywriter, though. )

"Whoever fights monsters should see to it that in the process he does not become a monster. And when you look long into the abyss, the abyss also looks into you."-Nietzsche