I know the differences very well.  We have published numbers from the Obamacare exchanges, as well as "what if" analysis available from many of those very websites; the actual costs by putting in differing income levels.  Someone working, but making too much to qualified for fully subsidized insurance (Medicaid) or partially subsidized insurance (Obamacare) can learn how much they must reduce that income to obtain subsidies which actually increase their net benefit.