Which castle is the most difficult?

Okay, let me start by saying that I haven't played against live opponents in a long time, maybe ten years (a couple of games with my dad don't count), so I might have serious disagreements with tournament players. But I didn't see "The most difficult Castle in a tournament game" in the topic. I agree that on a small map, a Warrior will win by quickly overwhelming the opponent with "three Gnolls and two Goblins." But if the map is large, with many neutral creatures and objects, a Mage hero's attack and defense stats won't be much different from a Warrior hero's. But mana regenerates, while creatures don't. The ability of Mages to move quickly around the map (portal, flight, door), and fight without losses (blindness-resurrection) gives the Mage the opportunity to gather a larger army than the Warrior (with his loss of Castles and creatures), and even if they meet in a "fair" fight without magic, the numerical superiority will be on the side of the Mage, and then it's anyone's guess who will win. Regarding archers: will the Castle's archers really be defeated by Swamp creatures? Valeska and Wistan have a specialization for their archers, which gives them the same bonus and shooting ability – let's discard these parameters, let's say there are 10 archers (str) against 10 Lizardmen (lizard). Archers have damage of 2 or 3*2, attack 6, defense 3, Lizardmen have damage from 2 to 5, attack 6, defense 8. It's unlikely that the Lizardmen will constantly hit for the maximum, and besides, the archers go first... Regarding building up an army – do you always manage to leave slow creatures to guard/in the Castle/with another hero every turn? I don't have time to play against people, except maybe in offline mode, and even then, it's not certain... But the tournament players are right here :D