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I meant the same thing! And they don't need speed on the battlefield...
You're right. They slow down the entire army.
But objectively, the Castle of Life is weaker. Then comes the Fortress. But that's just my opinion. Besides, the Castle of Life always turns out to be more expensive. I constantly run out of money for angels. With Chaos, it's not as bad as with the Castle of Life. And building knights to save money is stupid; it only weakens the castle even more.