The more useful one is the Orion Catapult Witch Doctor. Orion can recruit pigs from both the front row and the range, and then use the silver to create the Catapult AOE damage to form a no man's land.
Alone in the world
The soldiers are all rubbish, and the minions behind them will all die with just one skill.
confusion in the wind
The witch doctor must not be used, otherwise you will be stuck.
Quiet night waiting
Where can I find a pig summoner without this skill?