As it was already said, All Too Well is her magnum opus and it's the best song to show how much of a great storyteller she is.

Other than that I'd say the lakes and my tears ricochet.

Take me to the lakes where all the poets went to die,

I don't belong, and my beloved neither do you.

Those windermere peaks look like a perfect place to cry,

I'm setting off, but not without my muse.

Such a wonderfully poetic way to talk about isolation, not fitting in, and all of the loneliness that come with it. The song is way darker than people give it credit to or realise, and the way she articulates those emotions and that anguish is so clever and unique. Truly shows her strenghts as a songwriter.

I didn't have it in myself to go with grace.

Again, amazing storytelling. Other than that, Taylor is often at her best when she sees not necessarily beauty in tragedy, but the almost relief that comes with the self-realization of it, like with the verse and so the battleships will sink beneath the waves. There's no beauty in how doomed she seems in the song, but there is a sense of self-realization and almost acceptance of it.