Which creatures from the alternative upgrade options do you choose?

Everything is wrong :) First, there are very few definitive choices, second, read the thread from the beginning, and third, you should still try both upgrades in practice before drawing conclusions about stats/abilities ;)

Major Whirlwind, I made my choice based on the characteristics of the creatures. As for the druids, I sometimes take new ones. But most often - the old ones, because lightning is more powerful than ranged attack. And I only upgrade one type of magic, and in most cases, it's either light or darkness.