Of the two warbands, stylistically the Darkoath appeal to be the most, and I can see myself putting together an Age of Sigmar Slaves to Darkness force built around a core of these (We are now at the point where the entire Warcry range can make a beautiful force for larger games such as AOS)

Looks wise, these are very much reimagined Chaos marauders, and it wouldnt surprise me if they simply replaced them (the warband is a very Age of Sigmar friendly 10 members too compared to some of the other warbands) we even see lots of nods to old Games workshop models of old, with the Proven with Greatblade being very reminiscent of some classic models and the Hero Quest artwork

Their abilities key off this with ways of granting additional attack actions, increasing their stats or reducing the toughness of their opponant.

While the Brood are more sneaky and tactical, the Savages are a little more straight forward in their playstyle, favouring smashing heads in with greatweapons!