All approaches to communism so far have required massive and brutal dictatorships to even incompletely enforce this set of economic rules on human society. This is not an accident. Human beings are hard wired for collaboration and hierarchy both.
Capitalism also sucks unless it's heavily regulated by an independent system. The Dutch East India Company was not some libertarian paradise either. As a side note, "Anarcho-Capitalism" is a joke.
If Denmark and similar nations' approach to social democracy can work in 3rd world nations and is eventually allowed to by 1st world nations, that will probably be the best option.
The "Star Trek" imagined universe does not appear to be communist or capitalist. It appears to be post-money. The people on earth appear to have a solid safefy net and being given resources in accordance with a true meritocracy and ROI that our current capitalism lacks.
They also appear to have mental health cured, without a mass lobotomizing of humanity.