In the ACC, you can see two types of coupons: unversioned coupons and coupons. The two types are identical in all ways but one: coupons are supported in a versioning system (such as Content Administration) while unversioned coupons are not.

If you have Oracle ATG Web Commerce Merchandising, you can create multiple versions of a coupon and publish the appropriate one to your sites using ATG Content Administration. So, if you have Oracle ATG Web Commerce Merchandising, use coupons; otherwise, use unversioned coupons.