[Yoda]

What is the difference in roll when the club is horizontal to the ground and when it is incline to the ground?

For Ideal Compression (2-C-1), on all Planes (Inclined, Horizontal or Vertical) the Flat Left Wrist remains Vertical (to the ground / horizontal plane) through Impact. This assues a 'Closing Only' Motion of the Clubface, i.e., no Layback (and hence, no loss of Compression).

Assuming a golfer operating on the Horizontal Plane -- a very unlikely situation -- the Feel will be No Roll. On the Inclined Plane -- almost always the case -- the Feel will be Roll. In both instances, there will be a Full Roll of the Clubface (Clubhead toe along the Target Line in the Follow-Through / Section 11). Not the Half-Roll of Angled Hinging or the No Roll of Vertical Hinging.

If you do not understand what I have written -- almost certainly the case -- you do not understand Hinge Action. Then, there are only two courses of action:

1. Quit, and forever rail against the 'complexity' of precision Mechanics while embracing the inadequacy of stand-alone Feel, or . . .

2. Study, and, ultimately, command the Action and own your Golf Stroke.

The choice is yours.