Earls or Jarls.

Mish-ganare you really going to take Erls if there's no Battle Fury rune? And warlords can be used with priests in all battles - Fire Sign + Fireball or Wall!

Of course, it all depends on the battle tactics.
Erls - because in one turn they can attack several opponents at once (Chain Lightning), I think this is what makes them superior to Warlords!
Honestly, I think the Battle Fury rune is overpowered, and when it drops, using it with Erls is just... (sorry, but it's true)!
Don't forget that Erls are also strong with another rune (Berserker - double strike). I choose Erls because, with normal initiative (compared to other dwarves), they go into the enemy ranks first (closer to the archers), especially when I play against Elves, Humans, Orcs, and Mages, and thanks to their Chain Lightning, they eliminate dangerous archers and inflict serious damage on nearby units! It all makes sense!