All castles in Heroes 3.

In my opinion, Fortress has the best atmosphere of all the castles. And all the units are very useful, you just need to know how to use them.
P.S. I can't find anything better than Fortress.

You see, that's the main thing in any castle. And in general, I don't mind playing as the Swamp, but I don't really like that there's only 1 archer unit, and even they are, frankly, weak... But otherwise, it's a great castle, and the specific tactics for playing with it are great, IMHO!