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I like them all; each has its own advantages. Skeletons have good defense, zombies too, poltergeists steal resources from the enemy (or am I mistaken?), vampire princes can blind, liches can resurrect their companions twice during the game (if they don't use mana for something else), banshees have the "Banshee's Cry" ability, and dragons, after an attack, reduce the defense of enemy creatures (or am I mistaken again, I don't remember)). That's all I remember about them.
P.S.: I just haven't played the fifth game in a long time, I don't have the time.