You need to define both of these. When people think Fascism, they automatically think of Hitler and say omg jews are dead fascism = bad.
When they think of Communism, they think omg ameriocan propaganda pinkos want to kill us all!
For example, Fascism comes from the word union or league in italian. Only after Ww2 the ideologies of militaristic, racist, hateful, etc, became "core" ideas in it (Defined by the American victors of course.)
Communism, same thing. If we think of communism, we think of crazy dictators always killing others for their own good and never going fully out with the communist ideal. Always the wrong people in charge.