The process and tips in the book work for anyone buying just about any kind of health insurance. The comparison can be done for Medigap (supplement), Medicare Advantage (HMO/PPO possibly including pre_script_ions), and Medicare Part D (pre_script_ions) choices, including using the spreadsheet download and comparison graph at
http://www.besthealthinsurancebook.com/Resources/Resources-Homepage.html.
The book will more specifically answer what each of the Medigap/Medicare choices available in your area will cost the insured _base_d on the premiums, ongoing expenses, and that can be compared to any options for which someone might be eligible under special programs for folks who qualify for government assistance. I suggest always considering government assistance when eligible, and using the spreadsheet to compare government assistance with private insurance options.
For example, take the choices that you're considering from
http://www.medicare.gov/MPPF/Include/DataSection/Questions/ListPlanByState.asp where you put in your state, then take the monthly premiums for the plans which you are interested in considering, and plug them into the spreadsheet. The book also covers rip-offs and problems with getting health insurance that in some cases depend on state laws. An example of a rip-off were a number of Medicare Advantage (HMO/PPO) plans that stopped doing business in states such as Florida, leaving folks stranded and in some cases unable to afford other options.