I like all kinds of books but like any reader, I have my own standards to pick what I call "the best" - i.e., what I like the best. One way to define that further is to call it a combination of style and substance.
One of his best - the mature writer. This one suffers only from excessive domestic scene-bloating, and blinkered adherence to the official narrative of the lone gunman. But hey, it is fiction after all. Check that... it might even spill over into your life, as it did mine: http://nowickgray.blogspot.com/2013/04/jack-ruby-and-other-talismans.html