Since you are comparing the short story with the film made about it, you could use that idea for the title. You could also use the topic of these works, which is about the love of a husband for his wife who has Alzheimer's. Generally, a short statement of the main evaluation point or a question makes the best title. Here are some ideas:
Alzheimer's Love Story Works Best in Film
Does a Film or Short Story Tell an Alzheimer's Love Story Best?