You wrote >4WD and AWD must factor higher than 10%

And I replied that they do not. 4WD/AWD have relatively miniscule impact on the driveability of a vehicle in snow compared to a similar vehicles equipped with only 2WD. 4WD and AWD are effectively the exact same, with only a handful of minor differences in regards to the function of the system, NOT the driveability of the vehicle.

The only thing that actually matters, unless you're stuck in a snowbank, is the tires you have on the vehicle. That's it.