Subjective

Top 10 Metallica songs:

10. Disposable Heroes
9. Wherever I May Roam
8. Fade To Black
7. Jump In The Fire
6. Blackened
5. Battery
4. Welcome Home (Sanitarium)
3. Orion
2. The Four Horsemen
1. Creeping Death

Top 10 Megadeth songs:

10. Hangar 18
9. 99 Ways To Die
8. Sleepwalker
7. Killing Is My Business...And Business Is Good
6. Anarchy in the UK
5. Devil's Island
4. Peace Sells...But Who's Buying
3. Wake Up Dead
2. Symphony of Destruction
1. Holy Wars...The Punishment Due

Top 10 Iron Maiden songs:

10. Fear of the Dark
9. Dance of Death
8. Alexander the Great
7. Caught Somewhere in Time
6. The Number of the Beast
5. 2 Minutes to Midnight
4. Wasted Years
3. Rime of the Ancient Mariner
2. Powerslave
1. Phantom of The Opera