[Quacker]

Normally Winter tyres tend to perform poorly in the wet but much better on snow and ice and even mud.
Grippiest tyres should, by convention, go on the back. This is especially important if only two winter tyres are fitted and used on snow. It is much easier to control a marginal front end slide than if the arse end tries to overtake the front end. It happens very very quickly. Hence many tyre fitters, such as Costco, will not fit new tyres to the front only of a car unless a waiver is signed absolving them of responsibility should an accident occur.