Just worked out my tire mileage, and I have 92,300 km on two Yokohama Guardex winter tires, and 67300 on two Michelin Arctic Alpin.
The Michelins are pretty much worn out by now, the Yokohamas have lots of tread. The Michelins had a low tread height to begin with and seemed to rely on a soft rubber compound and lots of sipes to get its traction, the Yokohama on 'threads' in embedded in the rubber. Corresponding with the CR report the Yokohamas had quite a bit more traction in snow, IIRC the Michelins are supposed to brake better.
Abt 30,000 of the Yokohama mileage was winter, the rest was done all year round. The Michelins spent 5000 as a pure winter tire, the rest year round. To be fair the Michelins spent their time on the back axle of my pickup and took a lot of weight at times hauling heavy loads in the spring/fall moving my gear back and forth from university.