What is the best Medigap plan that will give me the best coverage?

Plan F gives the most coverage. Your provider will depend on where you live, but they are very similar because the different plans must meet certain criteria set by the government. However, prices vary, so if you are fortunate enough to live in an area where you have choices in insurance companies, check their prices on Plan F (and other plans) and also double check what they cover. A good Plan F policy covers nearly all co-pays that Medicare B doesn't cover. The other plans have cheaper premiums but cover less.
Carol