Decorative border knife and flat knife, which one is better?

We could customized bag sealing knife according to client’s real demand. But normally, we prefer suggest customer to use the decorative border knife. Because this type acctually is double sealing, there will be some checks shape. It could make the bag stronger. If the goods is too heavy, decorative border side could protect goods better. While there is a small broken hole,the decorative border type will not broken continue,but the flat type will let the whole side broken. On the other hand, decorative border side sealing is beautiful than flat side sealing.