Yep those are some amazing tires.  I have Blizzaks on my Suby and they are amazing in the winter.  The driving performance in unbelievable.
Anyway, SkierX posted some good articles.  For the actual drivability, if you are careful the AWD car will probably drive as well as the FWD with snow tires.  However, that is just driving.  Stopping is a completely different entity.  Stopping aka using your brakes, is completely independent of what type of drive your car has (FWD, RWD, AWD) unless you are using engine braking, but still uses much of the same principles as brakes and you won't be using engine braking in an emergency stop situation.
Your brakes really actually do nothing to stop your car, it is all in your tires.  Your brakes convert the kinetic energy of your axle assembly in to thermal energy which is then dissipated. Your tires are what convert the lower amounts of kinetic energy in to stopping power.  If you have shit tires, even though your kinetic energy drops drastically, you can still maintain speed if your tires suck and you will slide.  With all-seasons, the rubber is much harder at the low winter temps, since they are really just 3-season tires, and so they will be too hard with the wrong tread pattern to grip the snow well.  Winter tires will grip the snow very well, and will thus give you excellent stopping power since it is entirely dependent on your braking system, which for both cars will be working on all 4 wheels pretty much equally.
tldr: For the driving part, the cars will probably be similar.  However, with the stopping the FWD with snows will be much better.