Normal to drive specifies that the projection is done normal to the drive geometry, this is not useful for machining the side walls of a closed pocket.
Toward drive was introduced to be able to machine the side walls of closed pockets.
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Imagine machining inside of a large tube.
With normal to drive, the path projects from infinity and always lands on the outside of the tube. This is the traditional APT behavior.
With toward drive, we start at the surface and back away, allowing the path to project on to the inside of the tube.
If there are no overhangs, and no eclosed areas, then both should yield the same result.
No, these options are for projecting the tool path onto the part, not for controlling the tool axis.