Who tells the story? Is this the best person? Why?

Mr. Utterson tells the story from first person point of view. His point of view is, however, subjective as he is not really the main protagonist. Utterson is a flat enough character to let the reader discover clues to the case as they unfold to Utterson. He is also a fairly reliable character to take us through the case. The same could not be said for Dr. Jekyll.