Like someone earlier said, it has to do with age. I am turning 50 this year, so I’ve got to go with Clint, as I have seen more of his work. One of my favorite movies is Gran Torino.
I was enamored with the cowboy movie-star John Wayne when Clint was just another guy on the weekly series "Rawhide" (I'm 56).
Over the years, though, I've been won over by Clint's slowly building persona - a (slightly) more varied, complex character than The Duke.