I haven't seen all of the movies and I never read the books so my opinion is of little value. As far as the most accurate film representation, I have no idea. I liked Daniel Craig's Bond better for the same reasons that I like the new Batman movies: they're darker, more realistic, less cheesy, and Craig's Bond is not this flawless, fighting robot like Jason Statham's character in The Transporter. I cringed through that entire movie, like most of his films. I remember when Daniel Craig was first cast as James Bond. People thought he was a terrible choice just like they thought Heath Ledger was going to be a horrible Joker.
George Lazenby kept to the Ian Fleming Bond more closely, followed by Timothy Dalton.
They also made two of the worst movies. "On her majesty's secret service" & "License to kill". Although I must say that "the living daylights" is one of the best.
OHMSS and LTK were classics; I always considered the worst Bond films as the Roger Moore and Peirce Brosnan movies (GoldenEye was excellent), they used too many gadgets. Fleming’s Bond smoked too much, used few gadgets, and was never able to form a lasting relationship with the opposite sex. A too perfect Bond is a flawed portrayal (Sean Connery).
George Lazenby kept to the Ian Fleming Bond more closely, followed by Timothy Dalton.
You pick the one James Bond that for the life of me, I can't remember.