For me Hyppergammon is fun but way too simple to enjoy it a lot! I want complications and Hyperthing is not giving them to me....
I vote for Fevga! Many people here in Greece say that Fevga is the King and Backgammon(Portes here) way beyond. I don't agree but i value Fevga as equal to Backgammon speaking about general greatness..... But speaking about strategical play Fevga is of course the King as it's the game that separates big brains from the others....