Originally Posted by
kevy_boy
Also depends on what you want from the programme.
If you are looking for upgrades (not using miles), then UA/CO would be your best bet.
If lounge access is your only requirement, then Aegean/Asiana as some others have said.
One other small bonus for choosing A3 as your dumping ground for miles: A reward ticket to Africa is MUCH cheaper than using AP. However, since there isn't a tier bonus given, it might cancel each other out...