Answer:
I would say expository because narratives are more personal and creative whilst expository essays are based on facts and evidence.
Step-by-step explanation:
"The expository essay is a genre of essay that requires the student to investigate an idea, evaluate evidence, expound on the idea, and set forth an argument concerning that idea in a clear and concise manner".
"When writing a narrative essay, one might think of it as telling a story. These essays are often experiential, and personal—allowing students to express themselves in a creative and, quite often, moving ways.".