If you've already sunk into the snow your wide tires are fighting against you already. The only way you're driving "on top" of the snow is if it's day old snow that's had some degree of melting and frozen again over night, even than I would be skeptical. Snow and ice nullifies positive effect of wide contact area due to low friction, and pressure plays a greater part. You should never air down tires in winter.There is a continual debate on this topic.
- Tall and skinny to get down to the soil and trudge through the snow. but your axles still drag through the snow and its easier to get high centered in the snow.
- Tall and FAT tires to float on the snow more. This is the Icelandic way and my personal preference. I'd rather climb on top of the snow and prevent dragging things in it.
Usually after a snowfall, there is the harder packed snow underneath the softer fluffy snow on the top. If you drive with wide tires then the car tends to FLOAT over on top of the softer snow and never fully reaches the hard stuff near the bottom. So if you want better stopping ability you have to reach down to the harder 'PACKED' snow, that's why you need those skinnier tires. Unfortunately most people think the opposite way, that's why you see wide winter tires everywhere.
I live in Winnipeg, Manitoba. It gets colder here than the surface of Mars. You realize real quickly that tall and skinny is the only way to go. The OP is Canadian and can back me up on how crazy Winnipeg gets with it's winters.
Something else to consider is the OP is in Canada, not Iceland. Two very different types of winter weather as Iceland is surrounded by ocean, this plays a part in their average winter atmosphere.
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