For Nature, it's strictly based on resources. To build Griffins, you need a completely useless and expensive Stronghold. The choice at the fourth level is difficult. It depends on the opponent. If it's Chaos or Barbarians, then Phoenixes are the obvious choice! Against others, it's better to take Mages. In the Portal, only Water Elementals. The growth rate of Manticores is too weak.
For Barbarians: Harpies - Cyclops - Birdlings. The chances of Behemoths surviving and reaching the enemy's front line are practically nil. They also don't work well as a living shield for Cyclops. Birdlings can much more effectively neutralize enemy ranged units, and they also have good speed, which means initiative! Although you need an unnecessary Castle to build Birdlings, they quickly pay for themselves. It's still better than slow Behemoths.
For Order... Genies. In fact, the entire Order tactic stems from them. The rest is not important. Based on resources and build speed.
For Death. The second level is irrelevant; the main goal is to reach the third. The third... Vampires come anyway from the skill, so it's better to take Poisonous Creatures. At the fourth level, Bone Dragons.
For Chaos. Medusas - Nightmares - Black Dragons. There is no alternative to Medusas, just as there is no alternative to Black Dragons. Ifrits... What's the use of their fire resistance? Chaos players are the ones who use fire! And with three slots and three stacks, they can disable the opponent, while the Black Dragons and Medusas finish off the rest. However, if there's a Chaos Mage with Order and the spells Teleport and Cat's Speed... then Hydras are indispensable.:smile04: