The following table lists some of the advantages and disadvantages of these two operations.
| Operation | Advantages | Disadvantages |
|---|---|---|
| MaxWaitSeconds=0 | Returns only properties that have changed since the version specified. Returns changed data only, providing better network utilization than RetrieveProperties. | Returns an empty set even when nothing has changed on the server. Depending on your client application, this might be inefficient. |
| MaxWaitSeconds>0 | Blocks thread until an update occurs. Efficient use of network resources. The only operation that you can cancel. | Blocks processing thread until updates occur. However, this call can be cancelled so you can monitor the time the operation is taking and cancel if necessary. |
