I find that really hard to believe. Do you have a source?
In some ways that's true if you look at the number of their own citizens that were killed by Stalin vs Hitler. On the other hand, Stalin had a longer period of time for his mass murder than Hitler did. But Hitler caused the almost complete destruction of Germany with the war he started.
In terms of living conditions, you are probably correct; although again, Hitler's starting point in terms of economy, civilization, and living conditions was much better than Stalin's, and we didn't see Nazism play out over decades.
Nazi Germany's soldiers on the advance engaged in systematic killing and regarded most of the population of the conquered territories as vermin; Soviet soldiers merely raped most of the women and did not engage in systematic killing campaigns, with some exceptions (e.g. Katyn massacre)
I'd say it's difficult to say which is more deplorable: Hitler killing millions just because of their ancestry, or Stalin killing millions in the Gulag because of paranoia and because it was a convenient source of labor.
If we're just looking at the success of the economic systems, leaving aside the mass murder and the devastating war, then what you're saying is correct.
Told that way, this is libel, one which the german revanchism very fond of. Not that people like you would care.