The job will come out better in either case if you can first truly flatten the face of the stock that contacts the fence. This is particularly true of the point location fence, which acts like a planer because it follows the shape of the face against the fence. A long fence has more of a jointing effect to it that is if the face touching the fence is not flat the stock still moves in a straight line at the blade so long as the fence is flat and the same points on the stock always contact the fence
