The Lord of the Rings trilogy is a bit ponderous, it's writing is rather old-fashioned. The Hobbit is more enjoyable, more plainly-written, a fun adventure.
I love fiction and non-fiction. Fiction books are a good study material for aspie's, I think. They're a way to immerse yourself in emotions, motivations, etc. They may be fiction, but the feelings people express in them have to ring true to life, or they wouldn't appeal to readers.