A wing with a sharp leading edge will stall sooner than a wong with a rounded leading edge. The stall strip is not bullet proff but it works by stalling the inboard part of the wing first. Tis caused the nose to drop and airspeed come up and you keep flying. Even if one wing still stalls a little sooner than the other, the ailerons are still working so you can keep the plane level.
Washout in the wing tip will do the same thing.
On full size planes they often stalled one wing first, so they all a stall strip to the other wing to make both wings stall at the same time. In the old days this was done by cut and try.