If a list you are monitoring is constantly receiving new entries and having them removed, list monitoring would be of little value because the list would be constantly changing back and forth between empty and nonempty. List monitoring is best suited for situations in which a list receives new entries on a less frequent basis.

If you are monitoring a large number of lists, determining which list changed states could be a lengthy process. List monitoring using a notification exit is more appropriate when used on a small number of lists.