From a purely statistical perspective, if you're talking only 1 Spear (reg or vet) then having the 3 vets is superior to 4 regulars. Once you get to having 2 or more units having the multiples is better, giving 4 regulars a 5% better shot at taking down 2 bad guys, and a 7% better shot at taking down 3 of 'em.
Of course, with more units you also give a greater chance of promotion. So there are other factors to keep in mind.
Of course, with more units you also give a greater chance of promotion. So there are other factors to keep in mind.
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