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Well, I said it and I'll say it again: ALL castles are equal.
There are different situations and different maps, in which one or another faction gains an advantage, that's all! For example, if a map consists of 90% swamp, then of course only Fortress will rule there, and there can be no talk of equality!
Added 4 minutes later
You can't prove anything to anyone, all races in Heroes are equal, that's my opinion.
And those who say no either just don't know how to play them or they just don't like Fortress.