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actually, the topic sounds like this: which unit is the best? The Dragon King isn't called that for nothing. If we only consider the units that can be summoned from a castle, then the Dragon King is the best. It deals damage like two other units (almost any), has twice as much health as the others, and also has more defense and attack.
But this is if we understand the topic as a 1-on-1 unit comparison.
If we consider it in the context of the game, then it's more likely to be the Phoenix or the Angel. We can also include the Devils (I'm not sure). Because the Phoenix is the fastest unit, it can be resurrected, and it attacks multiple targets. The Angel revives killed units, especially heroes.