I have not found a problem with snow getting under fenders on plowed roads. I might prefer the City BIke as it would have a lower bottom bracket -- lower to the ground in general on the packed snow and icy spots might be better. I have little experience with suspension bikes, but I would think that on ice, having a rigid fork and hardtail would help you have a better feel with the road. And since we're talking about winter weather on-road riding, an old Rigid MTB or a newer city bike would be my choice.
I commute on a 26" folding mtb by Dahon.
It's all about the tires. Nokian studded for snowy stuff, Schwalbe Marathon Winters (studded) for packed snow and ice. I use the Schwalbes.
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The bicycle, the bicycle surely, should always be the vehicle of novelists and poets. Christopher Morley