It depends on your needs. I still have some big plastics for step-in crampons so my single-layer winter boots are just some mild duty Merrell's (in maybe wide?--which is what I need in some circumstances). Just go to an REI or another more specialty store and try some on with winter-type socks.
Honestly not sure of the best recommendations these days. And depends if you go above treeline and/or do winter backpacks.