There are a lot of factors that will affect the details of your selection:
- snow type, high desert fluffy, northeast boilerplate and snot, PNW icy wet slop...
- daily thaw/freeze cycle
- salt and/or sand used on the roads
- how much car snot will you be hitting on your commute routes
Without details of your snow conditions, all of the details of any commentor's suggestion will be guessing.
I can offer these generalities; IMO, fat bikes confer no advantage when it comes to snow. They sound great on paper, but if you're floating on top of snow, that's a recipe for garbage traction. For the broadest range of winter road conditions, nothing beats a fixie. I could write you a novella why, but I'll spare you.

Notice that I'm riding road slicks in that pic (25 mile commute one-way).
The next best choice in my experience is a rigid 26” disc brake mountain bike. With a 26" winter wheelset, you can have snow tires, studded ice & snow tires, plus tires for summer trails. Most 26" disc mountain bikes can also fit 700c with clearance for as much as 32C. With fenders! Get yourself a decent 700c wheelset, and you have some summer zippyness. That's a lot of use case in one bike. Tons of choices for this style, but my all time fave was the Trek SU200, same frame as the 4300.

I can't find my pictures of this in winter configuration. But here it is in ultralight touring mode. Winter tires were Nokian on the stock 26" wheels.
