2.- The rest
Not to do a disservice to his absolutely fantastic filmography, but I do find Jaws to be his best work to date - or at least the one I'd call my favorite. Its an absolutely genre defining film, done fantastically well with the practical effects of the time and it basically made me scared of the sea to this day. An absolute classic.
To choose which would be my 2nd, 3rd or 4th favorite would be hard and unnecesary, he has so many good films. Needles to say, Kingdom of the Crystal Skull is not one of them.