Snippeting your own song (at least in U2's case) usually beeats snippeting others' work. Vertigo (Stories for Boys) vs. Beautiful (In God's Country snippet)
Vertigo/ Stories For Boys vs. Exit/ Van Morrison's Gloria vs. Beautiful Day/ Sgt. Peppers Lonely Hearts Club Band vs. Discothèque/ The Fly
If we're talkin' studio versions, God 2 wins. If we're talkin' live versions, Bullet wins. Since I really only listen to live U2 nowadays, Bullet wins. So... Bullet (live ZooTV) vs Bullet (live PopMart)