Johnny Cash versus Cat Power.

You can't really compare the sun and the moon, and you can't really compare Johnny Cash's The Man Comes Around with Cat Power's cover of Remember Me, so I just made the decision, after three hours of repeat listening and reflection, that they are both deservedly pretty much the co-best song ever.

Johnny Cash
The Man Comes Around
American Recordings IV: The Man Comes Around
2002

Cat Power
eMusic Session EP
2006

NOTE: I am embedding one of her other beautiful covers,

Paths of Victory, as Remember Me is not on Spotify.