In your opinion, which faction is the strongest in Heroes 5? Let's discuss the advantages and disadvantages of each faction.

People with their spells won't be able to remove the debuff.

Sp doesn't affect removing the debuff; only the skill in Light and the level difference between the heroes matter. In general, Berserk is more effective because it can't be dispelled at all, but if the Knight runs out of mana, then Subdue can be used.

2. The bonus from attack damage with a charge is unlikely to be greater than the bonus from Berserk, but it also depends on the situation.

With Sp 14 (Darkness Expert), the damage bonus is already greater than for running 8 tiles.