Medicare here plus AARP Plan F supplement. Fulltimed for 15 years with DH who had a serious heart condition, which eventually caused his death. Had many hospitalizations and doctor visits plus cancer treatment in Houston at MD Anderson. Never paid a penny for any of it.
But I don't think a Medicare Advantage plan will be your friend. It's my understanding that those plans are more specific to your region, so traveling with the plan is problematic. That is what I have heard, so make sure you do your homework before purchasing a plan.
With Medicare you can seek treatment anywhere and with any doctor who accepts Medicare.
Dale