Well, Vetinari was an assassin. Death is always the option for him. With Granny, she will make sure that you get exactly what you deserve.

All too often, Granny will just sit there watching and not saying or doing anything while what you deserve catches up with you. Tiffany Aching, OTOH, will stake out her baby brother as bait, then slam the monster lurking in the creek with her mother's second-best cast-iron skillet when it appears.