if you are going to a ski resort, you need snowboots not wellies.
some of the surface will be ice, some hard snow, and some wet snow. A soft rubber sole is quite good as it will grip even hard shiny ice, whereas a hard sole won't.
As you will sometimes be in wet snow or slush, any absorbent surface will get very cold and wet, as well as dirty in the village.
shops and bars will not want you wearing anything spiky, and it wioll probably slide on a stone or tiled floor.
get your boots from a ski place not a fashion place. You are not looking for a walking boot intended for hiking. The warmest thing I have ever found was moon boots.