Just my thoughts.
I flew the Grob 109B as an instructor for an Air Cadet VGS unit and we always used the rudder to pick up a dropping wing close to the stall. I now mainly fly a C172 but I was also taught to use rudder during my PPL training and that is the method I have always used since. I will however quote the passage on "Use of Controls Before the stall" from my Oxford ATPL notes:-
"It is important that the stall should occur with the wings level and that the controls may be used on the approach to the stall to ensure this. Because of the low speed, the controls will be relatively ineffective.
However it should be remembered that moving a control surface modifies the chord line and hence the angle of attack. If an aileron is moved down to raise the wing, the increase in angle of attack may cause the wing to stall, resulting in that wing dropping. Near to the stall the rudder may be used to lift a wing by increasing its speed as a result of yawing. The rudder must be centralised before the stall otherwise a spin could develop after the stall."
Basically this says to me that rudder is safer close to the stall as when you use the ailerons you are actually increasing the AOA due to the altered chord line and this could easily be increased past the point of stalling AOA. With the rudder however you are increasing the dynamic pressure(speed) of the air flowing over the wing and thus producing more lift which causes the wing to pick up.
Just my tuppence worth, interesting reading though.
Regards
UA