In 6th Edition you could take a Primary detachment of Sisters, an Allied detachment of Guard and an Inquisitorial detachment. You could then nominate either an HQ character with the highest leadership from the Sisters to be your warlord, or an HQ from the Inquisitorial detachment.
In 7th Edition you can take a Combined Armed detachment of Sisters, an Allied detachment of Guard and an Inquisitorial detachment. You can nominate any character from either the Sisters or Inquisitorial detachments to be your warlord. Which ever detachment you choose will become your primary detachment. If you choose the Sisters then you your Warlord is an 'Ideal Mission Commander' .
To know if you should play a Battle-Forged or an Unbound Inquisition list will come down to how many troop choices do you intend to bring in your other detachments. As it stands right now henchman war-bands will never benefit from being in a battle-forged list, and inquisitors will only benefit if they bring a couple squads of grey knights and leave the their relics and warlord traits at home.
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