it depends on how it is being quilted- if sending out to a long arm quilter she may not want one long vertical seam- a horizontal seam will lay flat along the take up roller- a long vertical seam builds up with each turn of the roller & causes floppy sides-
if you are quilting it on your domestic machine it is not a big deal how you piece it...anyway that works= that you like= that works with the print (if using a fabric besides a solid)