Just to add to the conversations/videos above.
A full snow tyre only really gives its best when on hard packed snow as in the videos. An all season tyre is probably better for what we see up here unless you live miles off the beaten track and your road does not get swept/gritted.
Full snow tyres are not the best on wet or dry tarmac whilst all seasons excel on slush/wet snow/thaw water.
Buying a 4x4 with UHP, low profile tyres is totally pointless if you then expect to get grip on winter roads.
The cost of 4 winter/all season tyres and rims from somewhere like Blackcircles is often less than the insurance excess you will have to pay when you bin the car