Online? Dictatorship. Let the guidelines be clear and the conversations civil and on topic. If my speech isn't wanted in a particular community I can find another, or make another where I'm the dictator.
IRL? Democracy. It sucks, but it's better than everything else. I do, however, wish there were better laws forcing media to be locally owned, and bound to be truthful. And some way to keep late stage capitalism's hand off the scales.