Which castle do you like best in Heroes 2?

I like the Knight Castle the most, and Barbarians are my second favorite; the rest don't have any particular advantages over each other. My favorite units are ogres (I remember building 20 ogre lords once and using them to clear an entire map), vampire lords are also great in combat, and I also like paladins, wizards, giants, and their upgraded versions, purely for their appearance.

Added 1 minute ago

and in the third game, the unupgraded swordsmen are decent, better than with a bucket =)

I completely agree.