There are so many options!
I think this is an important choice to make.
So for snow boots, there are these three famous brands, Sorel, Kamik, and Baffin.
I used Baffin at one point, except that they were too warm for the winter temperatures in France.
Whatever the quality of the shoes, the socks that go with them are important, for me merino socks are my choice.
For the winter coat, I'm mostly on the move, so I chose a layered option that I can take off and put back on depending on my needs and the weather.
For example I have merino underwear like Icebreaker, a light or heavy fleece like Patagonia, and then the outer layer, either a windbreaker, or a softshell like Mountain Hardwear.
So I think whatever technical jacket you choose, it will have more or less these qualities of insulation layers, so maybe the outer layer is important to consider for its capabilities against wind, rain, and snow, because if this first outer layer does not do its job well enough, the technical qualities of the other inner layers will lose their effectiveness.
It's definitely worth considering and investing in something that will follow you like your shadow.