Hero and commander leveling depends on the commander's specialization.

in my opinion, the best combination is ATTACK + HEALTH + STRENGTH + MAGIC POWER. As a result, you get an invincible tank that: 1. instills fear 2. deals maximum damage 3. attacks twice 4. after the attack, the enemy cannot retaliate 5. paralyzes 6. uses Breath of Death Ideal for taking down the strongest enemy monsters :)