The best way to buy with confidence is to compare multiple options, both when you initially sign up for Medicare Supplement or Medicare Advantage plans. Medicare Advantage plan options change from year to year, so it's best to talk during the Annual Enrollment Period (AEP) each year. This year, AEP begins on 10/15/21 and ends on 12/7/21.
If you're not happy with your plan Medicare Advantage plan, you're also able to switch during the Open Enrollment Period from 1/1/21-3/31/21. You're able to either switch to another Medicare Advantage plan, or back to Original Medicare.