If your braking foot is on the floor, and all four wheels are in ABS active mode, I don't see how the quality of braking components in a limited traction scenario makes a difference. If on a track...yup, totally agree, heat build up, brake fade, etc. are terrible. In the middle of winter, stopping on a snowy road, I don't see how anything other than the quality of the ABS system and tire selection make any difference...AWD, 4WD, FWD, RWD...no difference...
Yeah, but pedal to the floor ABS stops aren't really what you want in many low grip situations, especially on surfaces with higher static grip than sliding friction, like ice or hard packed snow, or if you are in a corner as once you start to slide the outside rear tire, you may be going sideways for a while until you counter steer and get off the brakes almost totally....
In my experience, 4WD with the front and rear axles locked to the same speed does provide the best straight line threshold braking, as all 4 tires approach the limits of static grip together, which is better than the same vehicle in RWD as its always the front axle which locks first. How much better stopping in 4WD? 10-15% maybe if you are a good threshold braker. I found though that it makes the vehicle a little more susceptible to oversteer under braking in a corner though as the rears lose grip equally with the front tires.
I think some vehicles with part time AWD, they decouple the front and rear axles when the brakes are applied and especially if the stability control is engaged, to allow the brakes on each wheel to work independently?
Anyways there is always an optimum setup of ABS, tires, suspension, weight distribution, etc for a specific condition. Cars are tuned so they can work OK in the majority of conditions and not too scary in any likely condition, and so are snow tires as well.
For example, if you are driving in fresh dry snow on top of clear pavement or gravel, locking the tires totally probably will have the shortest stopping distance, but on ice, locking the tires would be much worse... Or I like to get snow tires with a sharp edge on the shoulder tread so when the tire slides sideways it cuts into soft snow or slush instead of gliding over it, but of course a square edge is bad for hard cornering on pavement....