All castles in Heroes 3.

If it's just a simple answer to a question, like a poll, then I'm voting for Barbarians! By the way, besides the well-known behemoths, eagles, and ogres, I also want to mention Wolves! I really like them! :) The way they charge in and then strike with their sabers is great! And then they follow up with a "finishing" attack! It's quite effective. :) As for defense, I like using elemental or Dungeon creatures the most – 2 medium (tough) ranged units + a weak unit that attacks and then dies. The most important thing is to cast Mass Bless.