Libba Bray's Beauty Queens would just run away with the title for both of the categories I'm taking on (Teens and Narration by the Author or Authors.) (This tendency to just assume the one title you've listened to will be the winner is part of the impetus behind the Armchair Audies, as I understand it. I'm extremely prone to that myself, so participating in this project is a fun challenge for me.)
Duerden has a lilting English accent and an aptitude for character voices. She manages sibilant spirits, a possibly-evil beautiful stranger, the dullard local swain, and a petulant sisters with aplomb. Everyone is distinct and so appropriate to their character. She totally avoids my biggest pet peeve of going too nasal or whiny to differentiate the voices, so everyone is easy on my ears. She did a great job with Briony's emotions - her trepidation, excitement, worry, love, sadness, and fear are all translated smoothly.