4 season / all season / "M+S" is not anykind of standard. Comparing to Nordic Winter tyres with or without studds they all are kind of summertyres (usually lower "speed class" than tyres without that mark). If you live in a country where you have quite often snow or ice on streets, I suggest using real Winter tyres. In Nordic countries we have to use them if we like to drive on winter (dec-jan-feb is a must and nov->apr You may use them here in Finland). I personally use
Nokian Hakkapeliitta 7 studded tyres in size 17" 225/50 RF.
btw. this company Nokian Tyres used to be part of
Nokia which made mobile phones, computers, cables, tyres and rubberboots