snake strike is more terrifying.
You can murder a spider by squashing it or spraying it. The snake is way bigger, and harder to kill. You can't spray that stuff. You have to shoot that serpent to really expel it.
I am not exactly scared of their appearance, but scared of them because of their easiness of being able to enter inside of a house without notice. They could be in your very own bedroom and you not being aware of them, stealthy, small, and deadly.
AHHHHH! IT'S IN MY HAIR!
Often smaller things are creepier