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Paladin is awesome! And looks great! But, in my opinion, it's not interesting to play with commanders. You level him up, and he'll have 1.5k health, and then what? You become invincible...
Actually, I agree that it's not interesting to play with commanders, and in general, Heroes of Might and Magic is not the same as it used to be...
As for who is the strongest, it's probably a commander from the Stronghold. When there are a lot of ballistas, it means Game Over for everyone!