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Yes, that's exactly what it means. Some castles are stronger, some are weaker...
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Yes, that's exactly what it means. Some castles are stronger, and some are weaker...
I asked the question incorrectly... (Which castles are considered strong, and which are considered weak?
I asked the question incorrectly... Which Castles are considered strong, and which are weak?

Everything depends on the map being used.
For example, on a number of M-U maps, the Tower is considered one of the strongest Castles. Why? Because it always has a native secondary Castle without a Fort. And this means a good bonus for the attacking stack – Gremlins.
But on larger maps, the Tower usually doesn't make it into the top three favorites.
One of the most stable Castles, good on most maps, is the Castle. It has the largest selection of buildings, excellent troops at almost all levels, increased importance of the external stable, the possibility of both ranged and melee attacking stacks, and so on.
The Rampart is also a versatile Castle. It has troops to suit every taste, fast or durable, and good damage-dealing ranged units.
But the Dungeon is very dependent on both the map and the setup. The presence or absence of a key resource location. The richness of the map and the starting difficulty level. I remember playing against an equal opponent, and my secondary Castle at level 117 was as developed as his main Castle, while my main Castle already had Manors (the game was at 200%). He was just unlucky. Therefore, the Dungeon is not as versatile a Castle as the previous two. Besides, the Dungeon is quite strongly tied to Shakti; if Shakti is not available, it can be difficult to progress on a resource-poor map at 200%.
The Swamp also depends on the map. In principle, it's a strong Castle, but it requires tactical skill, and its strength increases significantly if there are many Hives – because you can upgrade Wyverns, and morale doesn't decrease!
The Stronghold. An ambiguous Castle; on poor maps at 200%, there may be difficulties at the start. After all, it's an attacking Castle, but you need something to attack with! In the un-nerfed version, considering the number of Goblins and Wolves, it's not an easy choice. But almost always, Birds are used, and several times I've placed 117 creatures on level 117 at 200%.
The Inferno. Here, on resource-poor maps, there are problems at the start. In general, playing with this Castle requires a certain level of preparation; it's not that simple. Ifrits are amazing on the first level, of course, but in general, you can't play the Inferno mediocrely. Either you have to play it well, or you should exclude it. In difficult situations, it makes sense to think about "small Hydras."
The Necropolis and the Conflux. Don't play them yourself or let your opponent have them in the early game. It makes sense to first gain experience playing with the Necropolis and Conflux heroes, and then switch to the Castle. In games that don't have tournament significance, be sure to try playing as the Moon Castle whenever possible. Also, in several games, you can use a Necro strategy; this is something that every player should have in their arsenal. However, in my opinion, it shouldn't be a universal weapon; sooner or later, you'll have to pay the price.
Conclusion: decide on the map. On almost any map, the Castle will be a good choice. The Rampart will also work in many cases. Don't let your opponent have the Necropolis and the Conflux.
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What is "aas"? I think it refers to a scout (secondary hero). Is that correct?