Empire uniquely encourages a group mentality. A "team evil" ethos, albeit with a few catches.

By contrast, Scarab embodies a ruthless individualism where conflicts between cultists are intentionally positioned as the most interesting aspect of the cabal. Likewise, Scion's hierarchy lacks the "team evil" ethos: falter and you are murdered rather than demoted.

Out of those doctrines, it's self-evident which two need to be made preeminent.