There will be no aerodynamic differences that you will notice while flying by using a symmetric (zero camber) section on the tail surfaces. The tailplane/elevator is actually just a variable camber airfoil anyway, not two 'wings' hinged together. The fin/rudder is essentially the same. No doubt there will be plenty of other opinions, but the proof of the pudding etc. is when you fly the thing anyway.
Evan, WB #12.