The Ariens Platinum and Professional models, high end John Deere models use the Hillard AutoLok differential. This allows a wheel to rotate faster than the drivetrain. In practice, it is as if the snowblower automatically freewheels the OUTSIDE wheel in a turn.
Some other snowblowers have levers to free wheel either the left wheel or right wheel. Some have two to free wheel either wheel at the operators choice.
Intuitively, if the inside wheel is free wheeled, the snow blower will power its way around the turn. If the inside wheel is free wheeled, it should try to fight the turn. If that is the case, the automatic differentials would always be fighting the turn. Additionally, if the turn had snow or other resistance, the operator would have to provide the effort to push the outside wheel along its longer arc.
In practice, is that how it works? If you have a snowblower with the Hillard differential and have used it in snow, how well does it work. How does this compare to your experience with a free wheel capable snowblower? The differential should be better than a locked axle snowblower; however, is it better than an operator controlled free wheel?
