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If we are talking about a direct confrontation between improved units without magic, wall against wall (exactly this situation is described), then the Castle is definitely stronger. It probably has the strongest growth in the game, with the Tower as its only competitor. But such confrontations almost never happen, and the Elf has Kirra, fast and powerful units at the start, and a guild at the end. Many believe that in a random map like Chaos Maps, the Rampart will even be slightly stronger than the Castle, and in general, it is second only to the Necropolis. And the Tower, with its excellent growth, is already considered one of the weaker castles, although this is somewhat compensated by very good respawn points, in contrast to some powerful Dungeon, but one that spawned in an inconvenient underground location.
If we are talking about a direct confrontation between improved units without magic, wall against wall (exactly this situation is described), then the Castle is definitely stronger. It probably has the strongest growth in the game, with the Tower as its only competitor. But such confrontations almost never happen, and the Elf has Kirra, fast and powerful units at the start, and a guild at the end. Many believe that in a random map like Chaos Maps, the Rampart will even be slightly stronger than the Castle, and in general, it is second only to the Necropolis. And the Tower, with its excellent growth, is already considered one of the weaker castles, although this is somewhat compensated by very good respawn points, in contrast to some powerful Dungeon, but one that spawned in an inconvenient underground location.