Ley
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I prefer the Swamp faction because of its undeniable ease of development. To build dwellings for creatures of levels 1, 2, 4, and 6, you don't need any resources other than wood, stone, and gold.
Well, except for, as you put it, dragonflies (2 sulfur and 2 mercury) and bull-chariots :D (also sulfur - 5 and also mercury - 5). I just wanted to clarify.
Furthermore, the Swamp territory itself often creates a significant problem for the enemy.
Add to this the "armored" nature of the Castle, the достаточно хорошие abilities of some creatures, the ability to quickly build Wyverns, and decent heroes - and you get an army that can not only put up a good defense but also become an aggressor.
P.S. Who disagrees?
In principle, you listed many things, but you shouldn't forget about the snake pits - this is undoubtedly a big plus of this Castle...:), but still, believe me, there will be people who will try to refute your words, and each of them will do it in their own way, but they will still be right...
Sincerely.
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."