shatteredmindofbob wrote:

Any idea how this compares to Scrivener? Recently used that on a major
writing project and discovered how truly awesome it is when dealing with
something big.

Papyrus is a completely different approach - it's more like a traditional word precessor such as Word, LibreOffice Writer, Wordperfect. With a lot of writer's tools with respect to spelling, grammar and style.
Splitting an existing document into various parts and - vice versa - building a long document by combining smaller parts - that is where Scrivener shines.

Franz