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So, the poll is about level 6 creatures, and I answered based on that (considering no magic use and equal parameters). The Dreadknight will definitely deal some damage. In general, the difference between minimum and maximum damage is an important factor for heroes. A Knight with double damage will hit, and the damage will be 15, which is like a Naga hitting, hitting with maximum damage – it will be like a Naga hitting twice, but it's a gamble. And in general, Champions are also not bad for building up your army.
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And by the way, if you're going to poll about Warlock, and Naga has Death Blow (which is essentially the same as Dreadknights), with certain upgrades, but in Warlock, there are Nightmares, a terrible mix of Gorgons and Unicorns + Dragon's Breath, a fairly strong unit due to its Death Gaze.