Could someone please advise on which program to choose: Miles&More or United Plus? I fly often (business class) from the IAD to Europe and Africa. Both United and Lufthansa does transatlantic, but only Lufthansa goes further. I also fly from IAD to to Asia, where United and other *A are the choices. Which ariline's FF program is better? (Awards to Europe/Africa, upgrades, lounges, treatment of "elite" members, etc.)
Much appreciated.