Crank arm length doesn't matter much. Regardless of leg length &c we can all walk up the same staircase and it feels normal to each of us.
While it is true that longer cranks give more leverage, more leverage is not needed in normal cycling.
When choosing between two cranks that are otherwise equal, choose the shorter one.
+1 This is the correct answer. Most of the "fit" associated with inseam is fixed in the seat post.