Hi Gilles Hudicourt,
I would like to know what Accelerate-Stop advantage, if any, the 4 wheeled version has over the 2 wheeled version.
There is no advantage. This link has no reference to the number of tyres / wheels.
Engineering Inspiration - Brake System Design Calculations
The maximum braking effort on any wheel depends on the weight exerted on the tyre and the coefficient of friction between the tyre and runway.
If you have more wheels - there is less load per wheel - hence less braking effort per wheel - but the total braking effort is unchanged.