M+S basically just means they look promising, it doesn’t actually mean they perform in snow at all, compound plays a bigger role, normal tires get really hard and loose all traction in the cold. The absolute best option is dedicated snow tires (3-peak rated), next best is “all weather” tires, which also have the 3-peak rating but are suitable to drive on year round. They’re not as good as dedicated snow tires, but way better than “all season” (M+S) tires.
M+S basically just means they look promising, it doesn’t actually mean they perform in snow at all, compound plays a bigger role, normal tires get really hard and loose all traction in the cold. The absolute best option is dedicated snow tires (3-peak rated), next best is “all weather” tires, which also have the 3-peak rating but are suitable to drive on year round. They’re not as good as dedicated snow tires, but way better than “all season” (M+S) tires.