Answer: Mussolini and Hitler had similar ways of thinking. Stalin did not. They were on opposite ends of the spectrum. Stalin was communist, Hitler and Mussolini were Fascist. So their political views were wildly different.
However, they were all very ambitious, stubborn and intelligent people. They were all awful no doubt, but their intelligence can’t denied. They all managed to convince/fool an entire race into conforming to an extreme belief, which is destructive to others.
I guess the single most important trait they had in common was that they were all manipulative.
