What advantage does an active-standby configuration have over an active-active configurations?

Both active-standby and active-active configurations support configuration synchronization between peer devices, so this is not a distinguishing advantage unique to active-standby.

Active-active configurations utilize hardware more efficiently because both devices process traffic simultaneously, so active-standby is actually less hardware-efficient.

Power consumption differences between the two models are negligible because both configurations require all devices to remain fully powered on and operational at all times.

In an active-standby configuration only one device handles traffic at any given time, which simplifies troubleshooting by providing a single traffic path to analyze and a clear log source for investigating issues. Active-active configurations introduce complexity because both devices simultaneously process connections, which can lead to asymmetric routing, split-brain scenarios, and state synchronization issues that are harder to diagnose and resolve.