Which faction do you like the most in Heroes of Might and Magic IV?

It all depends on the player's experience. Optimal has mastered the Haven faction inside and out. Anyone who plays as Haven at a decent level and against worthy opponents should appreciate it.
But it's better to try all the factions. Optimal, don't just focus on Haven. Maybe you should try Necropolis and crush Haven with Necromancers?! Who knows...