I build my biplanes with the lowest angle of incidence on the wing with ailerons as I want that wing to continue flying andcontrolling the airplane after the others have stalled. I also believe this is how they are supposed to be designed. If in doubt, I would make the top wing have the lowest angle of incidence, it would ad stability similar to dihedral when approaching stall speeds.

Oh, oh, I feel a disagreement coming on!