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Low or high revenue % from taxes can be good either way. For example, the high number in Germany stems from the fact that a lot of state income comes from social contributions (unemployment or pensions but not health insurance) which are by meaning not taxes while social security in the United Kingdom is tax-funded which results in a much lower number for the United Kingdom.
Germany has mandatory health insurance, health insurance firms are separate from the government
Each way has its advantages and disadvantages. For example, a tax-funded system has a wider basis for revenue which may reduce payments for people but the money raised from taxes is typically not assigned for specific goals so the budget for social safety is up to the government. On the other hand, an insurance type of funding means that only some people contribute which may mean higher costs for payers but only protected people can benefit from the system. Also, the money is earmarked for a specific target and the budget is not only up to the government.
