Recomendations on winter commuting bike:
6-7 mile commute, 2/3 bike trails, I have subway options in the extreme blizzard conditions.
Probably will go with studded tires.

Candidates:
Folder with 305 wheels. Shorter fall, I have many extra 305 knobbies I could get stud kits for, my folder is a cheapie so salt damage is a don't care.
Electric with 559 wheels, RWD electric.
Mountain bike using a convention RWD system.
Mountain bike using AWD wheelset. The AWD wheelset could not be used with anything other than the MTB.
Road bikes.
Attaching a Schwinn Town & Country Trike rear end to a recumbent using 406 tires to make a delta recumbent.
The Town & Country rear end could be mounted to several of the other bikes rear, but is not usable in conjunction with the RWD electric or the AWD. It also may be mountable to the front of some to create a Newton/Welsh Trike style of upright tadpole.

My past experience is that the electric motor frees up the legs to help keep the bike upright on ice.
2 wheel recumbents are disasters on ice.
In my younger days I was very comfortable riding road bikes on ice, but I no longer will risk broken bones that way.