This study is an excellent study of the various plans for providing health care insurance

Executive Summary:

This report concludes that, across these eight countries, the ability of citizens to obtain expensive medical procedures tends to increase in proportion to their ability to purchase insurance for medical care beyond what public entitlements cover. Single-payer systems, which restrict the ability of individuals to purchase private insurance, deliver consistently worse access to specialty care or surgical procedures—without reducing individuals’ overall out-of-pocket health-care costs. Relative to countries that restrict private insurance, the U.S. provides good access to high-quality care, but individuals who fall in the gaps between employer-sponsored insurance and public entitlements are at risk of high costs. Systems that seamlessly integrate competitive private insurance with well-targeted public subsidies prove best able to make use of private resources with minimal gaps in coverage.
Some interesting comparison - from American Thinker:
The Manhattan Institute study included some fascinating survey results. Two revealing data points, reproduced in chart form in the study, came from a 2016 Commonwealth Fund international health policy survey. Respondents were asked whether they waited two months or more for a specialist appointment in 2016. In the U.S., the figure was 6%. In the U.K., the comparable figure was 19%, and in Canada, it was 30%. Wait times were thus three to five times greater in two countries with single-payer health care. Another survey question asked whether survey respondents waited four months or more for elective surgery in 2016. In the U.S., it was 4%. In the U.K., it was 12%, and in Canada, it was 18%, again revealing a significant increase in wait times in single-payer systems.
For those of you who claim that waiting extended periods as long as M4A or single payer is implemented. Fine, move to what ever country has the system you favor, but, don't dare to make that choice for Americans who prefer comprehensive and PROMPT resolution of healthcare issues.