Gee -- I don't know. Think for a minute --- If YOU were a bad guy, what would intimidate YOU? Now, do you think pulling a gun to "intimidate" someone makes sense? What if you KILL him because your gun didn't "intimidate" him? Are you ready to go through what it takes to get a "no bill"?
I'm of the opinion you don't pick a gun because it "intimidates" -- you pick it because it might save your life. You pick it because you can carry it concealed, are proficient with it, and feel it will do the job when necessary.
Next someone will ask which gun is best when you go out to yell, "Hey you kids, get off my lawn!!".
I think a full size stainless steel revolver in 44mag, a full size stainless steel 1911, or a Glock held "gangsta' style" would intimidate. Now, if you don't practice -- it doesn't matter -- the guy with the 9mm who does practice will do more than "intimidate" you.