What? It was absolutely about the economic system. Churchill and the Dulles brothers and like every important political figure in the west didn’t just dislike Russia as a superpower, they outright stated at every point that it was the economic ideology of communism they hated. Why in the world would they do things like invading Vietnam (who wanted to work with the US and considered them allies) or funding terrorism in Indonesia while they were ACTIVELY allied? They were very open about this. Where are you getting the basis of your opinions from exactly?

Also both systems work best when they are the only system everyone is participating in.

Not true. Capitalism without a mix of socialism is complete disaster.

The United states, and most of Western europe, were fucking with the Soviet Union long before it became a superpower. Technically they were fucking with it before they even became the Soviet Union. During the Civil War while the whites and the reds were still fighting the United States and other countries were putting their fingers on the scales trying to help the whites.

Truth is only capitalism had a chance to prove its worth without real external threats, and failed miserably.

Edit: I meant it failed for the people. It actually did wonders for the ones who imposed it.