I voted Madeen, not only because of the attack power when you first obtain it, but because of the graphics of the Eidolion.
Odin
Leviathan
Bahamut
Ark
Ifrit
Shiva
Ramuh
Atomos
Carbuncle
Fenrir
Phoenix
Madeen
I voted Madeen, not only because of the attack power when you first obtain it, but because of the graphics of the Eidolion.