Against which factions is it easier for demons to fight, and against which is it more difficult?

Grok is taken, along with new Archdevils. Grok's first spell teleports the new Archdevils somewhere to the center of the map. The teleport increases their initiative, and they immediately pull the archers towards them.

Wouldn't mass Dispel be simpler?
Besides, after this action, the devils will be on their way back to Shi'o. All the Sylvan troops will reach them, and the druids might even shoot at them directly. And what if the enemy also has a teleport?