I spend most of my reading time in tech manuals, procedure guides, and the like which are related to work. So, much of my reading is non-fiction.
I can't really say what the worst book was, as I don't recall it. Blocked memory perhaps?
But, here's a quick hit list of some of my favourites:
Sci-Fi/Fantasy series: "The Eternal Champion" series of books by Michael Moorcock, "The Hobbit" and "Lord of the Rings" books, "Thieve's World", "Dragonlance" (First two series), "Star Wars Ep. Iv, V, VI", "Star Wars Thrawn Trilogy",
Comedic fiction: "Flawed Dogs" by Berkeley Breathed (Same guy who did "Bloom County", "Opus" and "Outlander"), "I Suck at Girls" by Justin Halpern
Military Fiction: "Hunt for Red October" and "Without Remorse" by Tom Clancy, as well as a few others I can't recall
Non-Fiction: I'm big into a few themes such as Early American history (Revolutionary war and founding of the nation, Civil War, etc) as well as WW2, Vietnam and Gulf War. Early European history such as Viking, Roman Empire, and Rennaissance era. Add in some hobby books, etc and rounds out much of it.
My favorite children's book: Ferdinand (Still have the one my grandma gave me when I was about two. Read it at least once a year, and give new copies to friends who have children about the same age as I received it)