Magic in Heroes of Might and Magic V.

Shouts are not just a formality; their essence is the same. Moreover, all spell deflection effects also apply to the Horde's Fury.

Furthermore, the Shout cannot be worsened in any way, such as by reducing magic resistance or using the same blocking effects.

What should I believe?

In different situations, the Horde's Fury can eliminate more enemy units than the Warlock's Earth Shock.

Haha. Well, I wouldn't say that happens often. Hypothetically, if you have a 10th-level Warlock and a Barbarian with 10,000 warriors, there's nothing to compare, but in general... it's not a very good example.
And of course, magic is much stronger than shouts. Can a mass bless with +1 attack and 20 fury be compared? Well, or whatever the numbers are...
And for the most part, shouts last for 1-3 turns. These are buffs. But Light is limited only by the amount of spellpower.

Added after 56 seconds
while I was writing the post and getting distracted, you guys managed to spam a lot...