John Wayne’s best movie, in my opinion: The Shootist.
Bonus: also in the movie are Jimmy Stewart, Lauren Bacall, Ron Howard, John Carradine and others.
Also good is The Man Who Shot Liberty Valance, which includes both Jimmy Stewart and John Wayne.
Agree with you that Treasure of the Sierra Madre and The African Queen are awesome. For some reason, I really like the mood of Key Largo.
The last movie that, Lillian Gish, Vincent Price, and Betty Davis ever made.
Also appearing in it is Harry Carey Jr and Anne Sothern