Are we discussing the relative merit and importance of the two men, or of their literary works? I would say Woody Guthrie had the most impact with his life and work, and certainly neither man was a prime example of responsible behavior. But from the standpoint of creating a literary milestone, I think Kerouac's book stands far above Guthrie's. Which had the most impact on you or on me is purely subjective, and assassinating either man's character is useless.