Which artifacts are best to equip a hero with?

I usually equip my hero like this:
Before a battle:
1. If the enemy is a mage, I try to equip artifacts that provide protection against spells or reflect them.
2. If the enemy is not a mage, I equip combat artifacts (shield, sword, arrows, bows, etc.).
During normal gameplay (just moving around the map), I equip artifacts for movement (boots, sandals).