Searching far and wide with no clear answer on this fundamental question:

Does it matter if the roll axis is before or after the tilt axis in order of articulation of the the camera. Specifically looking at 3-axis gimbal design.

What is the effect of placing a gimbal motor for roll axis directly on the camera? As opposed to the tilt axis directly on the camera, with the roll axis moving the tilt motor and camera together. The latter arrangement seems to be predominant and I'd like to know if there is a good reason why.

Any knowledge or resources would be greatly appreciated!