My (disabled) son has been on Medicare over five years. During that time, we've gone through Traditional Medicare (with a Medigap policy), along with two different Medicare Advantage providers (due to change in benefits, as they all do).
For me/us, the Advantage programs worked out better in cost/services than Traditional Medicare.
However, depending on the state you reside in, different Advantage providers have different benefits/costs. You have to do your homework to investigate what is best for your indivudal needs, and see if they will provide better benefits than Traditional Medicare.