I like all their songs, but:
From the first show:
Sanctified, March of the Pigs, Piggy, Reptile, Gave Up, Help Me I Am in Hell, Me, I'm Not, the Way Out Is Through, Wish, Survivalism and Hurt
From the second show:
March of the Pigs, Piggy, The Frail, the Wretched, Burn, Gave Up, Help Me I Am in Hell, the Warning, the Way Out Is Through, Wish, Survivalism and Hurt
Both have Gave Up, Help Me, I Am in Hell and the Way Out is Through. But the first night has Reptile, which is probably my favorite song by Nine Inch Nails so I think I like that set better. This is how you do career retrospective sets AND promote your new album.
04/11 -- Black Sabbath
04/24 -- Nile