One connects you to people, the other reads your draft.
Reedsy's editor is the free front door to its real business, a curated marketplace of publishing professionals. That is a genuine strength: when you need a developmental editor or a cover, Reedsy puts vetted humans in front of you, and the editor produces clean files to hand them.
DraftProse is not a marketplace. It is the studio you write in, with a binder, a quiet editor, and a Reader. The two answer different needs. Reedsy is strongest when you are ready to bring in people. DraftProse is strongest while you are still shaping the draft.