Evaluating archers.

That's exactly how you should compare all units. Analyze the information you get and apply it in practice.
And if you want a specific situation, then provide it.

Here's a specific situation: one fairy can easily defeat a dendroid, which in turn can handle a gremlin... But the gremlin can defeat the fairy without any difficulty... Question: which of them is stronger?

Do you understand the difference? That's what I'm saying - everything depends on the circumstances of the battle.
Therefore, the maximum you can compare is the parameters of the units with each other, but you can never compare their real strength without taking into account a specific situation in the battle.