Others have answered your question, but I think you're coming at the problem from the wrong angle.

I used to think about politics and economics how you are now: that there are different systems, and different people disagree on which is the best system, either because of their internal values (liberty, security, equality, prosperity, etc.) or because they believe that one system inherently performs better than another (efficiency, robustness, fairness, etc.).

Becoming a Marxist is realizing that while we, the working people, are sitting around bickering over whether command or market economies are more efficient, whether parliamentary or Presidential systems are better, whether our voting system should be Ranked Choice or Proportional or FPTP, the wealthy - the owning classes, the Capitalists, the ruling class - are stealing from us, are extracting our labor.

Politics is not about different people having different ideas about how to best organize society. Politics is about different groups acting in their material interests. The rich support policies which give them more power in society, while the poor, by all rights, should be doing the same.

I support a system where working people hold all power in society. I don't care how that society is organized aside from that - I have some ideas, but there are smarter people than me for organizing logistics. Power and material interests are the only things that matter; and no system is incorruptible. Society needs to be lead by explicitly and wholly ideological organizations who will resist any attempt to undermine the power and supremacy of the working class, even if it is "legal" or "fair", and they are justified in using whatever means necessary to do so.