Haha, I can appreciate that argument, I love Justice.
But Fade to Black is my favorite Metallica song (one of my all-time favorite songs too), plus For whom the Bell Tolls AND Creeping Death? I give that the edge. But "One" may be my second favorite. and "Blackened" is incredible. It's a close call.
I would also have
Death Magnetic in my top 5 Metallica albums, because I am not a Metallica hipster who decided that they'd sold out with Black and refused to listen to anything they did subsequently.
Death was the sound of a band who'd recovered from all the ills they were struggling with during
Anger, embraced their position as former pioneers who were now elder statesmen of the scene, really found happiness working with each other and their new bassist, and made a balls out heavy metal album with no thoughts of what other people thought they should or should not be doing or sounding like. No, it doesn't sound like it was recorded in an abandoned factory in Queens, but it isn't supposed to. They've been there and done that.
Anyway, new song. Ace. Maybe the best James's voice has ever sounded.