Here is the information you are seeking:
Copper is the best because it heats fast and evenly.
Cast iron is 2nd because it heats evenly.
Steel is third because it heats fast, but not evenly.
Alluminum is 4th because it unevenly and will seep alluminum into your food.
Non-stick is last because it heats unevenly and can realease toxic chemicals into your food.
I hope this is as much help to you as it was to me.
-B