Well I have to say Chuck Norris because he will round-house kick anyone who comes near him no matter who it is. Second I have never even heard of Rambo so go Chuck Norris.
Chuck never REALLY is a great fighter,its just the movies he does,and Sylvester Stalone(Rambo) may be old but he sure still is buff!lol...the new rocky,he still is buff...
the question offers the answer itself. RAMBO is a fictional character. Chuck Norris is real. So very very real.
Now you tell me, what's more intimidating? Watching Sylvester Stallone sit in a make up chair and get primped, OR Having that beard come around the corner... A steely gaze spies you, his crows feet tighten, you'd swear they could squeeze diamonds out of charcoal. His tight jeans stretch as he widens his stride, you turn to run, but you know its too la- ROUNDHOUSEKICK!
Well, even though Rambo is just a fictional character, while Chuck Norris is real, I like Rambo better because he looks buffer and his movie was really cool. Well, that and because I don't really like Chuck Norris that much.