Sorel, like many other brands, has reduced in quality as they got more "trendy" much like Timberland did in the late 90s.

Kamik, Baffin and Pajar are still high quality and very warm. Kamik and Baffin I believe are still all Canadian made.

I have a pair of Kamik lined hunting wellies that I bought about 15 years ago at Canadian Tire for about $40 that are the warmest and driest boots I have. They certainly don't make much of a fashion statement, but nothing is better for walking the dog or shoveling the drive and walkway.
Not suggesting that you go that route, but it's a testament to their warmth and quality.