I am old fashioned and enjoy reading a physical book. It leaves more to the imagination. If you're familiar with the classic comic strip "Calvin & Hobbes", the author refused to ever make a movie or tv series for his strip. He said that every reader has an idea of what the voice of each character sounds like. To make a movie or show would diminish that creativity and take away from the magic of the series. That is how I feel about books. Part of the reason I often don't like movie adaptations is because of the diminished creativity entailed. Hearing a different voice from what I imagined takes away from some of the magic of reading the story.
That being said, I have listened to one audio book. My wife used to travel for work and she would listen to audiobooks. I traveled with her one time and listened to "Abraham Lincoln: Vampire Hunter". This is definitely not my kind of book. But the narrator sounded just like the guy who used to narrate the old A&E Civil War documentaries. So I felt like I was listening to a real documentary... with vampires. I tried reading the book, but hated it. But the way it was presented in audio format just made it seem real.
So as far as accents go, it depends on the book. If I were listening to a book such as Leon Uris's "Trinity", I would want to hear a narrator who spoke with an Irish or English accent. The book takes place in Ireland and England, so that is why. But I don't care for audiobooks anyway, so it doesn't matter much.