In truth the Nazis were fascists, who are Leftists. Mussolini was fascism's godfather. Hitler borrowed on it. Fascism give the pretense of private ownership. Yes you can own your own home but we're going to tell you how to live in it. Yes you can own your own business or factory but we control the production process. Communism pretenses none of that. The state owns and controls everything. In the end the Nazis and the Communists fought it out with each other in the streets of Wiemar Germany for power. Nothing less.
Yes, in practice there was not much to choose between the two systems, although Communism had one advantage in the eyes of many people: in theory, it was supposed to be humane. For the benefit of all mankind.
Nazism and Fascism never made these false pretenses. Both were in some way similar to religions, but you could always „convert“ to communism, no matter your heritage or your social status.
With Nazism, you were either „in“ by dint of your heritage, or you would be an outsider forever (in theory, though in fact it was sometimes indeed handled with a certain degree of pragmatism - obviously some people at the top tacitly acknowledged the pointlessness of the entire ideology).
Communism was more humane - in theory, and when all is said and done, only in theory. Not in practice 🙁