A headbite is the most mercy death

The chest buster would probably hurt the most.

Personally, I think the acid blood is the worst. I mean, imagine their blood burning through you, a painful burning sensation, slowly, until it either painfully burns one of your limbs off or reaches an internal organ. But the second worst is Chestburster.

Chestburster cause it is slower than the others so it would be painful as fuck

The bloodier the better, AKA worse for the victims...