If you only to read the magazine on your computer or mobile device, then choose the screen version.
Printing Notes : The magazine must be printed in “full bleed” mode. Bleed information refers to elements outside the finished piece. Often a printer requires bleed information on pieces that have bleed to allow for “printer bounce” when cutting a job down to size. For some printing services, failing to provide bleed information and crop marks can result in finished pieces showing a thin area of white on the edge.