I swear some of you on this site is like a hemroid..... LOL
Drivetrain wise, unless you have a 2013 Fusion with the 1.6L engine, you have the SAME trans and AWD system as the 2012 Fusion. Even bringing up the 2013 is a moot point.
Why in the world are you comparing a car to a suv for off road use? The SUV.... even a 2WD SUV would be better for off road than a car. Whats next? Are you going to tell me that a Jeep is better than a segway at a mall?
We are talking about snow anyways......
Platforms often now and days get shared between other cars. But they also get modded for the car that the platform is going to use. Its called cost cutting. Thats the reason why Ford stayed on top while the other two was on life support. Oh BTW, the 1st and 2nd gen Escapes was sitting on a modded Mazda 626 platform. Another shocker, the same cost cutting was used in the Jeep Wrangler with their 3.8L V6 which was Chrysler minivan engine for years..... come on now......
Unless you have a Wrangler Rubencon or any other SUV/Truck that its sole reason of being is to go off road, the OEM tires SUCK in the snow. Winter tires will always have that extra edge in the snow. So much of an edge that in my KK with winter tires, I was going through snow in 2WD with no problems that a KK with OEM tires needed the 4WD on. But back to the main point, lets just say we have 6 inches of snow on the ground. The AWD Fusion with winter tires will do you better than a AWD Jeep WK with all season tires EVEN if the Fusion is scraping the snow. The drive system will only do the work if the tires are able to keep up. Winter tires are made to bite into the snow and get rid of the snow from its tread. A all season tires, normally do not have a good bite and often can not get rid of the snow as well.