I believe many states have programs to advise Seniors about Medicare. In MA the program is called “SHINE” in other states “SHIP” here is a link to page about “SHIP” About Us | State Health Insurance Assistance Programs
I did A & B and an employer subsidized supplemental plan from BC/BS. I did not want to endure the gatekeeping of the Medicare Advantage companies, so even though an Advantage plan might have been cheaper, I was worried about all the in network/out of network hassle and claim screening they must do. Traditional Medicare is also completely portable if you move.