Ley
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They can simply deal more damage than the Black Knights. And, objectively speaking, Champions should be compared to un-upgraded Black Knights (the price is the same). Upgraded ones are stronger in most cases (it's a pity that you can't cast blessings on them).
Well, you said it yourself! The main principle of the Black Knights' victory over Champions is double damage, not health, for example, or stats... but where will this damage come from if they are un-upgraded? But even so, you write that "Upgraded ones are stronger in most cases."
But personally, I like Champions more, it's just that some kind of dwarves in armor are riding on horses :D
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."