Capitalism, in the extreme, can be thought of an auction type trade system with no regulation. Pure capitalism could happen in a system of anarchy (no government). Pure socialism could be thought of as a system where government controls production and the distribution of goods and services.
In pure capitalism we would see prostitution, drug trade, trade of slaves and trade in all types of weapons. Even parts to make nuclear weapons could be bought and sold. Military secrets could be bought and sold. Capitalism is an auction where the highest bidder gets what he wants.
In pure socialism, the government would force workers to produce. The production would be grabbed by other workers and distributed to all. There is no auction. Money could be a coupon.
Then there is what I call cultivated capitalism which is analogous to a garden, nursery or farm. The parasites and predators are controlled. Water is supplied when there is a drought. Fertilizer is added when needed. The soil is tested and the acidity/alkalinity is controlled. Regulations are made as to what plant grows where. Blights and diseases are controlled. Farmers have the choice to grow what they want, how much they want and by what method (organic or chemical).
Isn’t it obvious which system is best?