While it could be argued that the Beatles at their peak (Rubber Soul, Revolver, Sgtr. Pepper and White Album) were probably better than anyone of that era, there is no question that Dylan is far more prolific, he has lasted as a major influence for more than forty seven years, and like Picasso has had different "periods" as he grew as an artist. Lennon and Harrison died too soon, and McCartney, while a great tunesmith who occasionally comes up with something good and catchy has seen his best days long ago.