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That's what I love about the fourth installment – the individuality of each unit, which makes it difficult to definitively choose the best.
Monks shoot well and have the Death Ward. Crusaders also have it, plus a powerful double strike. Djinn are excellent flying spellcasters with a great set of spells, but they are very weak in melee combat in small numbers (in this case, "Illusion" comes to the rescue). Nagas... I really feel sorry for these units. They are strong in combat, and the enemy cannot retaliate against their attacks. But with Djinn available, players generally prefer them over Nagas. Although, personally, I often buy Nagas because they are quite helpful when facing Chaos and its Black Dragons. Vampires are possibly the best tier 3 melee units. Not only are they undead and flying, but they also attack without retaliation and drain life. Very useful. Poisonous Creatures with their poisonous ranged attack are also impressive, quite decent units. Ogre Magi perform quite well in battles, plus "Bloodlust" buffs their allies. Cyclops are generally excellent; their area-of-effect attack is very effective. Nightmares... Yes, these horses have annoyed me more than once, terrorizing my units. Excellent creatures with great stats. Flight, fire shield, and fire immunity make Ifrits very strong fighters; I always rejoiced when they ran away from me, because even in small numbers, they could give my army a good fight (this is just to say about their high speed). Fast Unicorns, blinding with their attack, are also very useful in any battle. Griffins are similar to Ifrits in terms of movement speed, retaliate against all attacks, and fly over obstacles – all of this is pleasing.
As you can clearly see, each unit is good enough and useful in certain situations. When voting, I hesitated between Vampires and Djinn, but my choice ultimately fell on the latter, because their magic can at least help spellcasters in melee combat.