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My favorites are the Legions of the Damned. It's fun to play with them. Sometimes, you have high hopes for luck. Essentially, they are the strongest race of all, with the most overpowered hero (Baroness). I've conquered cities with a single Orc Chieftain (one guarding it), a Troll, a Giant, a Hill Giant, an Orc, and an Orcish Brute – they all fell to the Baroness with an Enthralling creature. After the battle, there's often a level-up! This is how I expand my borders. It's also good to attack Ogres – we reduce their initiative by 15% with magic, and the Baroness outpaces them. When we attack, the warrior strikes, the Baroness intimidates, and so on.
The most useful (and longest-lasting!) magic is Invisibility and Phantoms (one of the cheapest spells).
All units are useful, even the warrior branch. It's impressive when the Baroness takes another city with an Inferno Warrior, and it regenerates a large amount of HP on the next turn. Even a minimal city provides 10% (city) + 20% (Inferno Warrior) + 15% (warrior leader) = 45% (!!!) regeneration.
Typhon + 2 Succubi is deadly against the Undead. Using Invisibility and flanking (Hellhound - Phantom), it's enough to cast a 15% initiative reduction on the undead unit, and that's it! The Ghosts won't have time to move. The problem, of course, is with undead warriors. But with this demon build, we'll move in after thoroughly "sprinkling" the enemy with magic.
All leaders are winged, so they move further.
Strategies vary depending on the opponent's strategy.