Nikon VR has an element that has to move around to compensate for lens motion. When powered up, the position of the lens is controlled. When no power is applied the element can move around, making a rattling noise.
I have never had a Canon, but I thought their motion compensation (Image Stabilization) was done in the camera instead of in the lens as Nikon is. Maybe someone could confirm or refute that statement.
Canon DSLR lenses have IS in the lenses if they have IS, not in the camera.
Canon's mirrorless cameras have IS in the body, and can utilize both stabilization types.