Three answers and two different opinions. Are you ready for a different opinion even though will require more fabric? I would put all 4 borders so that they are all readable from top to bottom as though they were on a page with the center of the page cut out (the center of the page would be your quilt top). Assuming that the words on the fabric run from one selvage to the other, the top and bottom borders would be cut from selvage to selvage. The two side borders would be cut along the selvage. So, it would require a long piece of fabric to cut the two side borders.