The style guide I use, THE CHICAGO MANUAL OF STYLE, uses the term "prose" for all non-dialogue or quoted material. The word "narrative" is rarely used. However, fiction web sites, as well as Stack Exchange, seems to prefer "narrative." So my question is: Is there a professional difference (I'm not really looking for a dictionary definition; I use Webster's)? And then some follow-ups: Are there regional differences? Does fiction v. nonfiction matter? What about poetry? Thanks!
Prose and poetry refer to how something is presented.
Fiction is something that is made up. Non fiction is something that is based on fact.
There can be no prose vs fiction debate since the terms refer to different things.
If it isn't poetry then it is prose, fiction or otherwise.
Prose is a form of language that exhibits a grammatical structure and a natural flow of speech rather than a rhythmic structure (as in traditional poetry).
Narrative is more or less storytelling.
You might get at better answer if you provide som examples of how you intend to use the two words.