The key is to try both and see which one works best for you. Best for you should be defined as minimal muzzle movement when the trigger breaks. I find that for me, the pad is key because it's easier for me to press the trigger straight back that way. If I hook my finger in, the trigger breaking has a tendency to pull the muzzle to my right (I'm right handed). Try both and see which one lets you get the least movement.
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