Client Characteristics and OD
This behavior offers options you can use to optimize delivery to requesting Clients.
You can use this to select a location that is geographically closest to the Clients accessing content via this property configuration, to optimize the delivery. This is one aspect of what we consider optimization via use case-based provisioning.
Client Characteristics and Mixed Mode Configuration
This is a "use case-based" behavior that's automatically included in the Default Rule and used to optimize delivery for all requests. However, with Mixed Mode Configuration for OD, you can also include it in another rule and apply different match criteria to have separate requests use different client characteristics optimizations.
For more details, see Use Mixed Mode with OD.