Democratic centrism is more of a rule or process or principle. It isn’t even a form of government and it’s compatible with many forms of government.

Proletarian democracy isn’t well defined so I can’t say anything since it means 1000 different things to 1000 different people and often does include representative democracy.

Participatory democracy similarly is a spectrum and is compatible with representative democracy.

So to actually talk about this you would need to be more specific about how the “better” form of government would work.