What is this obsession with tyres? Our Jazz has standard regular round black Michelin ES tyres with about 4mm of tread and they worked just fine in the beast from the east 2. Technique and ability are 1000% more important than tyres. I have never been stuck on snow or ice, and have only ever had standard tyres. I really for the life of me don't understand what all the fuss is about.
In balance, I have never tried all season or winter tyres, so have no point of reference as to the respective advantages. BUT, and it's a big but, as I have yet to get stuck due to having technique and ability why would I change for the 3 days snow we get a year.
When our Jazz tyres wear out, I may look at all season tyres for the better cold weather breaking performance. However, I allow ooodles of braking distance and alter my driving to suit the conditions as I have done over the last 30+yrs.