The way i like to drive the AD08R's are significantly better. Way more grip in both the wet and the dry (comparing my used RE040 to the new AD08R so not strictly fair).
Had some hairy moments under accelaration with the RE040, but the AD08R for me hasnt snapped on me under either heavy breaking or acceleration, cornering. you have to push quite hard to get them to slip and its progressive when they do slip. I find the RE040 in comparison is less progressive.