I think ultimately war is what determines if capitalism is superior to communism - an efficient market should, in the long run and over many iterations, make war easier to conduct because it makes more resources available and allocating them according to the highest need - high demand pays more, and more money thrown at a good causes more of that good to be made.

But communists can just mass produce the armaments for war and win, if they start at the same level of tech and innovation pauses. After winning, they fall apart and end up using death camps to fix their inefficiency, but that doesn't save the capitalists...

Idk. Distilling this down to a game is difficult. Using true principles while highlighting the differences of two incompatible systems... I think the key game element has to be innovation, but beyond that, too hard.