I recently read Ursula K. Le Guin's Earthsea books, really interesting in that first half are kids lit and the second half were written 30 years later for a grown audience.
Best of both worlds! Though I did find the kids books way more fun.
If you haven't already check out the "shelved by genre" podcast. They just did the entire Earthsea series (over multi episodes) and the podcast is seriously hilarious and insightful.