"The best book I've ever read was Atlas Shrugged in 8th grade. Changed my life." Not because I remember anything about it, or believe anything it espouses, or even like it all that much, but because it's a useful filter for obnoxious people in meatspace. If someone I don't know too well asks me what my favorite book is, I say Atlas Shrugged. If they react inappropriately, I'll be cordial and treat them with respect,…
But the best books are "A Canticle for Leibowitz", "Neuromancer", and "The Dying Earth".
I found Canticle kinda "meh" personally. It was a great premise, and the 1st third was somewhat interesting, but the rest fell flat for me. I'd say it was a book I wanted to like a lot, but the execution let me down.