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It will be like rock-paper-scissors, but in an expanded version.
Because high-level units will be able to defeat mid-level units, which, in turn, are effective against low-level units.
That is, if the enemy is only a few levels weaker, this advantage will be even more effective.
Magic will also have: different spells will have different effects on the number of units killed.
The advantage of this idea is that it's a single new feature that doesn't significantly complicate the mathematical model, but it opens up many new possibilities in game tactics. And this is a characteristic of great games, such as chess. :)