Choosing between Original Medicare (Parts A and B) paired with a Medigap policy versus a Medicare Advantage (Part C) plan depends on individual health and financial preferences. Original Medicare offers ultimate provider freedom nationwide and predictable costs with supplemental insurance, but requires separate drug plans and higher fixed monthly premiums. Medicare Advantage usually offers lower upfront premiums and includes built-in drug coverage plus extra perks (like gym memberships), but locks users into strict regional networks and requires prior authorizations.