It would depend on the Strategy. I choose some minions based on who I'm facing, but what I need to take depends more on what I need to do than who I need to do it to.
Specifically against the Viktorias, I would take Rasputina (the only Arcanist master that I have) and some Gamen to bounce spells through. If I needed mobility to accomplish my goals, I would take a Cerberus. If I needed survivability, than a Golem instead. If I were to run a totem, and I probably would, it would be the Wendigo, instead of the Essence of Power, as the extra flip on damage spells would be less relevant since none of the Mercenaries I would be facing have Hard to Wound.