Don’t forget that Avada Kedavra has the advantage that it can’t be blocked/mitigated/etc, whereas spells like stupefy presumably can (or that advantage of AK wouldn’t be worth noting).
More specifically, most spells can be blocked by the “protego” charm. AK cannot be blocked in this matter although AK can be dodged or can have a large physical object block it.
Don’t forget that Avada Kedavra has the advantage that it can’t be blocked/mitigated/etc, whereas spells like stupefy presumably can (or that advantage of AK wouldn’t be worth noting).
More specifically, most spells can be blocked by the “protego” charm. AK cannot be blocked in this matter although AK can be dodged or can have a large physical object block it.