What do you think is the most important joint for your tori?

I would say the chest.

Neck......... XD

they are all important, but chest is probably the most.

The most important join is the chest.

i say the hips how would u jump and stuff then

Lumbar.
After all, the camera DOES follow it.

Chest/lumbar.

You need them for so many things ^^

Chest glutes and ankles.

glutes are vital

left ankle