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Anyway, I did some math myself
And I have to agree with Iwanow, that Gallope in 99% cases is better

Will not write all the math, just say that +2Fire will add maximum +3,6 to average damage
while +1Shock will add minimum +9,6 to average damage

(considering 27 level: Fire modif = 0.3, Shock modif = 4; disc=100% and infantry opponents of 20-30 levels)