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and here's something else I'd like to add from my personal experience:
if you set up a random map with a Dungeon, the Dungeon will always be underground, and everyone knows how random generation works: a seemingly nearby mine with wood resources might be blocked by an impassable wall, and to reach the mine, you have to go around, clearing out hordes of enemies along the way...
a Tower always appears outdoors, usually in the snow, and there the degree of freedom of movement is higher (not always, but in most cases)...
therefore, if I choose a Dungeon, I trick them: I suggest playing on XL size but without a Dungeon... that's how I do it, and it's not very fair...))) maybe someone will use this advice.