Traction is physics; 60%+ weight up front kills inertia when you turn on slippery surfaces with FWDriven wheels. I do not like the inability of FWD to power out of understeer in snowy conditions. While I have never attempted winter driving in the last of the nose heavy RWD cars, like a Mustang, I do know that having prepared a Fox body Fairmont for AutoX, they are inclined to understeer with really benign rear ends (unless you dig deep for a power slide) at least compared to a semi trailing arm IRS... For the record I have never gotten stuck in 50/50 BMW's with snow tires.
While one could debate winter driving characteristics, I am old school having grown up with RWD in snow, but also getting indoctrinated to the benefits of FWD in snow via 1800 lbs '80 Fiesta. As an aggressive driver however, I like the flexibility RWD allows for getting power to the ground.