I'm unsure what an ideal economic system would be. I live in Belgium which is a country with high taxes and an established social security system which I'm happy with especially looking at health care because it seems to be very expensive in a place like the US while here virtually anyone can afford it.
Then again looking at the refugee crisis going on it seems to be common knowledge by now that a significant amount of these refugees are actually economic refugees looking for a better life (our social security system). Even worse, some of these people simply come here for benefits and send back money to their own countries so consumption in the country they're actually getting their money stays low. So I think if the government doesn't keep a good eye on how a social security system is being used problems can occur.
Looking at the prime example of capitalism; the US, I can see an obvious benefit of lower taxes: more startups. Seems like Americans are more entrepreneurial than Europeans, I specifically remember reading an article about how Germans tend to prefer traditional careers working for an already established country as opposed to starting up their own business.
Capitalism has benefits like a slighly increased overall prosperity of the population and more opportunities for indivuals to become very wealthy but also disadvantages like exploitation of people in poorer countries by companies in order to maximize profits.
Socialism has obvious advantages as in everyone, rich or poor, has easy access to basic rights such as health care and a minimum wage but when people become too tolerant of people exploiting it, the system cannot keep up in the long run.
As usual the truth lies in the middle and I think we should take elements from both systems in order to create an optimal system and I would say Europe is doing a slighly better job at it than the US at the moment, but I'd say it's far from perfect in its current state.