In my opinion, Inferno has weak ranged units, especially Lilims. The Matriarchs, on the other hand, increase their numbers by 20% at the start of the battle and steal mana from the enemy hero.
I haven't yet decided whether it's better in a duel to take 2 stacks of Lilims and apply a mark on the first turn, or to take dogs and turn them into kamikazes with the perk that increases damage for each tile moved... The problem against humans is that the Lightnings go before the dogs, and it's hard to guess where to place the dogs.