I think Scrivener also has different goals: Vellum looks like it's intended for publishing, but Scrivener I think of more as an organizational tool. That said,

I think Scrivener also has different goals: Vellum looks like it's intended for publishing, but Scrivener I think of more as an organizational tool. That said, I've been using Dabble if only because it's all cloud-based and I don't have to worry about syncing files around myself.