Is it? Norway has been topping all the livability charts for at least the past decade so that's the one I've always considered "the best in the world." Then probably the Netherlands, if you stretch the definition of Nordic.
It's more that Sweden is the biggest/most populous, and has the most internationally-recognizable brands (IKEA, Volvo, H&M, Husqvarna, Absolut Vodka, Spotify, Klarna, etc)
Is it? Norway has been topping all the livability charts for at least the past decade so that's the one I've always considered "the best in the world." Then probably the Netherlands, if you stretch the definition of Nordic.