"Best Eminem song" is like saying "Favourite time I got stabbed."
That's what I think about "Best Taylor Swift song"
My favorites are Stan, Like Toy Soldiers, Going Through Changes, Lose Yourself, Mockingbird, and maybe Sing to the Moment.
Well Em's lightning verse in No Love makes that probably one of his best.
It is one of his best, however I can't stand the Lil Wayne part of the song.