Historian Paul Preston considered Franco of that time to be much much worse than 'a Mussolini' even if you refrain from calling his regime fascist. He had the background as a colonialist officer and had an equally sociopathic disregard for human life.
I've always found it revealing that unideological pop culture use can be made of Mussolini without coming across as some sort of dog whistle (like how--I'm dating myself here!--in "The Ultimate Showdown of Ultimate Destiny" he's part of the massive coalition of historical and fictional figures that takes down Chuck Norris), whereas using Franco in that way comes much closer to using Hitler in terms of what it implies about the views of the person doing it.