Well Id give it to Possessed hand by a margin.
Remorseless, Amoral, unrepentant and truely murderous.
He strikes me as a cold motherf**ker from the demon hood.
'Thing' just seems.....thing-like and mischievious.
'Thing' basically dreams of being 'Possessed hand' one day.
I think that hand to hand, "Possessed Hand" gives "Thing" the finger.