It is important to understand what those options are and how are they going to impact during deployment. Following table lists these options, their description and recommendation for Cisco AVS.

* Immediate - Specifies that the policy is programmed in the hardware policy CAM as soon as the policy is downloaded in the leaf software.
* On Demand - Specifies that the policy is programmed in the hardware policy CAM only when the first packet is received through the data path. This process helps to optimize the hardware space.
Reference:
https://community.cisco.com/t5/data-center-and-cloud-knowledge/apic-policy-deployment-and- resolution-immediacy-for-avs-vmm/ta-p/3134812