The real trade-off between the two, without the sales pitch.
Original Medicare pays most of your care but leaves a share to you, with no annual cap on what that share can add up to. Both Medicare Advantage and a Medicare Supplement exist to deal with that gap. They just do it in opposite ways.
A private plan takes over how you receive Parts A and B, usually rolls in drug coverage, and often adds extras. It uses a network, and it puts a cap on your annual out-of-pocket costs. You typically pay less month to month and more when you actually use care.
You keep Original Medicare and add a policy that covers what Medicare leaves behind. Any doctor who accepts Medicare works. There is no network to check. You typically pay more month to month and very little when you use care. Drugs are not included, so a Part D plan is usually added.
Advantage tends to suit people who want lower monthly cost, are comfortable inside a network, and want extras bundled. A Supplement tends to suit people who travel, see specialists across systems, or simply want predictability and will pay monthly for it.
There is a one-time window when you first enroll in Part B during which a Supplement generally cannot turn you down or charge you more for your health history. Outside that window, in most states, medical underwriting can apply. That makes the first decision meaningfully harder to reverse than the second, which is worth knowing before you make it.
General information only goes so far. What is actually offered where you live, and whether it fits your doctors and prescriptions, takes about ten minutes to check. No charge for the review.