Original Medicare is run directly by the federal government and lets you see any provider who accepts Medicare nationwide. Medicare Advantage (Part C) is offered by private insurers approved by Medicare, usually with a defined network of doctors and hospitals, often with lower monthly costs and added benefits like dental or a gym membership.
The right fit depends on which doctors you want to keep seeing, how often you travel, and what extra benefits matter most to you. A licensed agent can walk through your specific situation at no cost to you.