I agree that Trump is no Mussolini - however I see why it's tempting to compare them, as they are both slightly comical figures with a great regard for themselves.

The closer parallel would be to another Italian leader: Silvio Berlusconi. He was also a businessman, is also famous for his attitude to women, also authoritarian, etc. Both men are great showmen, and populists who 'speak their minds'.

Of course, any analogy is imperfect - but it seems closer than the whole Mussolini/Stalin/Hitler one.