Here are the main takeaways:
-> If you prefer to squat "sitting back" then, in order to keep the bar centered over the feet, more forward lean will be necessary.
-> If you sit back, and are going to FULL SQUAT (aka "ass to grass", etc.), the hips will come forward as you descend below parallel.
-> Forward lean with a high bar position can be a lot of torque on the lower back.
-> Forward lean with the hips under you (and the spine flexed) will also be A LOT of torque on the lower back.
-> The hips should externally rotate to create spiral tension, reduce the need for excessive ankle flexion, and put the hips and legs in the most advantageous position to drive out of the hole.
-> Generally speaking, if you are full squatting then a high bar, upright position is going to be preferable.
-> Generally speaking, if you have a lot of forward lean, and your shoulders can handle it, a low bar position to parallel is going to be preferable.