It all depends on the grain of the paper.
What does long edge mean in printing. Short edge means the pages are bound along the short edge of the page. It’s always advisable to select paper with a long grain. Long edge means pages are bound along the long edge of the page (left edge for portrait, top edge for landscape).
When duplex printing, you can choose which way you would like your print to appear on each side of the paper using the short edge and long edge features. Short edge means the pages are bound along the short edge of the page. For example, long edge will mean that you turn from one page to the next along the long edge of the paper, much like an a4 magazine or standard brochure.