The computer usually builds Hydras in the first week, but Minotaurs may not always be built even in the second week. But then the guild is usually built. There might also be a green tower with one unredeemed dragon. Fighting a beaver hero who has redeemed the main armies in 2 weeks, even with dragons, is not easy. You need your own Warlock hero, who has visited at least a couple of gazebos. When the enemy army's hit points are reduced to at least 400, then you can start fighting.
In general, based on my modest results in the scenarios, I can say that on average, all castles are approximately the same.