Winter tyre selection is not always that straight forward. You need to know and understand a bit about them before you can make your decision. It is not as easy as just taking a set; you will need to know what conditions you tend to drive in, what is allowed in your country and what type of vehicle you have.
Snow, ice or slush
Is your main driving on snow, ice or slush? Studded tyres perform better on ice than non-studded tyres. If you live in areas that have a lot of ice, like coastal areas or close to very big lake, you might need studded tyres.