I voted Disappearer. It's not that I think it's the best (Cinderella's Big Score! Mildred Pierce! Scooter+Jinx! The first minute of Tunic! Mote! Titanium Expose! (with it's excellent Kim/Thurston makeout in the vid!)); I'd just hate to see it go on the first count, it's a class A song and it's gotta be the most visually appealing SY single out there (Death Valley '69 is class as well in that domain).
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The true test, after all, is to be like everyone else. Once that happens, he no longer has to question his singularity. He is free—not only of others, but of himself.