I've got to disagree with that. In fact, dare I say it, but I'd actually argue that John Wayne may be more iconic than Eastwood. Before you accuse me of blasphemy and tie me to the stakes (and you'd be well within your rights to do so :lol), hear me out. When you hear "Clint Eastwood," generally, two things come to mind: Dirty Harry and Blondie. With John Wayne, though, I'd say the man was bigger than any of his roles. That's not to say that Clint Eastwood's not iconic, he's probably one of my favorite actors of all time, but, take this hobby, for instance. When I think of who I'd want on my shelf, as far as Eastwood goes, I think "Blondie" and "Dirty Harry." That's not to say that his other films like Josie Wales or Hang 'Em High aren't iconic, but those two just "pop." With Wayne, though, when I think of "who would I want on my shelf?" I don't think "Rooster Cogburn, or "Ethan Edwards, or "John T. Chance." With the latter, I think "I want a 'John Wayne' figure."
I'll be honest with you, I like Clint Eastwood more than John Wayne, but, with that being said, I just don't know how anyone could objectively say that Wayne isn't iconic. Even if he's not as accessible to those who aren't American, being an "American" icon is still being an "icon."