If you have a load order volume of orders that the customer might cancel you could delete them to avoid having to filter through them. But this data is often good to keep for analysis to see if there are patterns of customer, items, prices etc that result in not completed orders. In Accounts Receivable parameters then you can use the mark order as voided option to keep a copy of the orders instead of actually deleting them.
Here is a quick overview.
AX2012 R3 CU9