My most absolute favorite genre is incredibly well written narrative nonfiction. The other genre I read the most is literary fiction, both novels and short stories. I'll read a good mystery from time to time (but nothing too scary), and I like to read kids books; I'm particularly fond of books at the middle-reader level (I'm a big Rick Riordan fan) and gorgeously illustrated picture books. I also find it hard to resist books on history and current events and bios/memoirs.
This book wins the trifecta of narrative nonfiction: well-written and organized, on an interesting subject not frequently written about, and beautifully produced. Wilkerson, the director of the narrative nonfiction writing program at Boston University, writes about the migration of blacks from the South to the North and West from WWI to the '70s.
The Phantom Tollbooth is one of my all-time favorite kids books. It just doesn't get any better than this. If you haven't read it, or know of a kid who hasn't, buy it. In bulk. And read and share.