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Castle is only good because of the Archangel strike stack; nothing else. Such dependence on one specific feature makes it unstable. Much depends on whether angel external dwellings are given (they aren't always, by the way), what cons are placed and exactly where. Clues are a pain again — angels are needed to open them. And you need quite a bit of gold for upgrades even for Jebus Cross; often on 121 you can't manage to upgrade them and have to go to Dragon Utopia for money. All this wastes precious tempo. Plus, you need to find antimagic quickly and level up any element to expert — without antimagic against a prepared opponent, even Archangels don't survive (Expert recently found out :) ).
Strong is good, but I wouldn't put it in the vanguard. Bears are good, but clearly not imba. Wolves too. Again, troubles with clues. So, it's a good stable castle, but clearly not top-tier.
Now, Swamp is just killer. Brogh's speed + a quickly assembled strike stack of wyverns solve everything. Easy in cons, clues, Dragon Utopia, and with ГО. A very convenient army that can achieve great things even with low-tier units. Plus, the acceleration from flies greatly speeds up resource gathering and chains for deep respawn clearing in the shortest time. Therefore, it's easy to maintain a high tempo; Swamp's exit is usually early and powerful. There is practically no hassle at any stage.
Necro is more of a pain to develop, but it's the most convenient castle for farming cons and hives on week 1. That's how it wins. With a lucky layout, it can start taking down Dragon Utopia as early as week 1, which is hard to do with other castles. But it's less stable than Swamp; it's easy to slip from high tempo to medium, and there's a stronger dependence on the layout and distances.
Rampart is mega-depressing. You can't rely on dragons, and there's nothing else. Maybe horses. But other castles have similar units. And shooters don't decide much on Jebus Cross.
Tavern is similar — focusing on shooters sucks. The only real chance is to find several giant external dwellings and quickly raise them to titans. But that rarely happens, and when it does, it's with a significant delay.
Flax is again a castle without a "thing." Development is slowish, no particular breakthrough power. But the troops and Moner are okay, and there's a chance to burn the opponent with Armageddon since there are as many as 4 stacks of immune troops. So it's not trash, but not exactly super either.
Regarding Inferno, there really isn't a clear opinion; it needs testing. However, at first glance, it's not obvious how to develop super-tempo. Cutting goats takes too long, and they don't decide things that much. Devils are good, but you need their external dwellings. You can't really farm cons with hives on week 1.