I heard a clip of @aggroed saying that both Death & Fire Elementals would be stronger than Earth Elemental, so in my mind, the advantage would be in the spell cards, not the monsters themselves.

Perhaps the Death Elementals will have a bit more health since they are already dead and that will give them an advantage. I'll also allow my appreciate of the Spineback Wolfs art to sway my decision in favor of the Death Elementals lol 🐺☠️