Actually, they're two different types of plans. Medicare Advantage includes your Part A (hospitalization), Part B (medical) and often Part D (prescription drugs). It replaces your Original Medicare (Parts A and B). Medigap works side-by-side with Original Medicare covers 80%, Medigap covers the remaining 20%. Medigap doesn't include Part D prescription drug coverage.
True. Medicare Advantage plans can provide all-in-one coverage if you choose a Medicare Advantage with prescription drug (MAPD) plan. Medigap plans aren't Medicare at all, so they never include Part D prescription drug coverage.
It depends on what plan you choose. You might consider Medicare Advantage with prescription drug (MAPD) plans to be more comprehensive because they include Part D prescription drug coverage. Medigap plans don't. Medicare Advantage plan premiums are based on the county in which you live, while Medigap plan premiums are based on where you live, your age, gender and health, and whether you use tobacco or not.