The best is the Dragon King. And he's strong, by the way. No one can defeat him in a one-on-one fight. In an army, he should be the only creature, not counting the hero. And there you have the best.
Here we're talking about level 4, but the Dragon King is far from level 4)).
Even though the Black Dragon is stronger than all the others in terms of stats, I like Archangels, Titans, and Behemoths. It's just a matter of preference.
