I think the main differentiator for inverted Y is whether you map the motion of the mouse into the vertical plane (i.e. directing your gaze, non-inverted) or tr

I think the main differentiator for inverted Y is whether you map the motion of the mouse into the vertical plane (i.e. directing your gaze, non-inverted) or treat it as a flightstick for your neck (i.e. directing forward/backward tilt, inverted Y).