Medicare advantage is a separate plan from straight Medicare....a supplemental plan augments Medicare and there are numerous plans to supplement parts A and B, but does not offer the extra that the advantage plans do like vision, dental, or prescription plans included. Our supplemental plan is United Health Care but I will only start using it next month and our agent did not advocate the advantage plans when a person has health issues and wants to travel to various areas. Idk if this makes sense or will be helpful for my husband and I?