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What does it mean when the ratio is equal?
with a weekly increase? and if it's a cumulative system...? (try to accumulate Berserkers :)))
if the question is about the strength of the weekly increase, then probably yes... if it's about usefulness, then... I would bet on the "nature" faction.
it's not difficult to accumulate Berserkers; a Barbarian hero quickly levels up in combat and clears mines on his own, while the army accumulates in the castle and waits for the final battle.