Two different jobs, often compared as one
Atticus is a formatting and layout tool with a writing surface attached. It is good at what it is for: turning a finished manuscript into a print-ready and ebook-ready object, with themes and trim sizes and all the fiddly typographic details that matter at the end.
The question worth asking is where your months actually go. If the hard part is producing and revising the draft rather than laying it out, a formatter will not help with that, and an editor will.
What an editor does that a formatter cannot
Muze Writer keeps your premise, characters, voice and outline in Story Core and reads them on every request, so suggestions land on your book specifically. It keeps version history of every draft, so a rewrite is never a one-way door.
And it reviews the whole manuscript in a single pass, reporting the problems that only appear across chapters: a character whose eyes change colour, a thread you set up and dropped, a timeline that stops holding.
You still need to export
So export is included. PDF, Word and EPUB on paid plans, Markdown, HTML and plain text on every plan. If you want Atticus for final layout after that, nothing here stops you — the manuscript is yours and it leaves in a standard format.