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Hellhounds are strong due to their abilities, but unicorns are still better. Djinns can strike with a saber, but they will immediately die from a counterattack :(. However, they are proactive, and warlocks are very strong.
I like to transform Inquisitors into cavalry – they are more useful. But sometimes they are more useful as archers. And what, are they that powerful with their spells? In Fortress, the Adepts with Blind were also good. But you can't get far with just one divine power.
Assassins with a mace are also good. But I'm disappointed by the slow and weak hydras. The Lich shoots weakly; undead, which equals "I don't like them," but they can cast plague, which is not bad. Flame Priests are very resilient with a strong fireball. In general, there are strong units at level 5, although archers still lose to harpies (only at the beginning, thanks to the fireball, the Flame Priests are an exception).
I voted for unicorns: magic aura, they hit well, and light units are also good (double resurrection). But I still wouldn't want to meet liches on a narrow path :(.