Also, just to clarify, Niether brand, Subaru or Honda has a button for AWD.
Plus does Subaru even make non-AWD? I though all their cars come AWD standard? There's performance expectations from their system as a result. Someone made a good point on "negotiating" the elements of the road. It appears Mazda's rear wheels engage as a result of sensors as to allow the driver to focus more on driving than compensating for factors.