[Formendacil]

Definitely Sauron.

Everybody knows that that guy is a Survivor. He survives the destruction of Utumno and Angband, he survives embarrassment at Luthien's hands, he survives the War of Wrath, he survives the war in Eregion, he survives the Downfall of Numenor, he survives his own death and the robbing of his ring, and even though he is reduced to a mere spirit by the Ring's destruction, he survives, nonetheless.

Clearly, the best Survivor of the bunch is Sauron.

++Sauron