This reminds me or that question, "What is the ideal government?"
Many people mention that a "benevolent dictator" or "good king" would be the best, but that is very subjective depending on what you mean by "best". Maybe fast acting but certainly hit or miss.
Anarchies tend to slip into might-equals-right situations; where the rich, powerful or just the most ruthless end up running the show.
An informed democracy would be just as utopian. The best kind of government should barely be felt in my opinion (so it feels like anarchy but it isn't): trash gets picked-up the trains run on time etc.
A bad government would be merely ineffectual, a worse one would be inifectual and intrusive.
"Communist Governments" were actually bureaucracies or oligarchies with communism being the economic system. There are plenty of social democracies in Europe, with democratically elected goverments that apply a socalist economy. That, to me, is best. The government (theoretically) looks out for the little guy (because the big guy doesn't need help) by providing networks of social support.