Hmmm...this is something I have never seen! It's always new in the braille world 🙂
My inclination would be to go with the title page. Especially with a graphic novel. The cover is likely very colorful and stylish to match the genre - the title page should be the more "detailed" info on the book. But - there are certainly no rules for this situation. You could ask the requestor which title they would prefer.