Who is more balanced Bike A or Bike B? [closed]

Suppose we have 2 bikes A an B such that their velocity , shape , model , power and radius of the tyres are identical. Mass of A is greater than B and both are moving on the same road experiencing same friction and air resistance . Now my question is that who appears more balanced bike A or B if we try to unbalanced them . On which bike the prediction of chance of accident is more ?