Wowza Streaming Engine uses what are called Stream Targets to distribute live streams to other servers and locations. We have several articles on this. Below is one for using RTMP to deliver content to third party destinations.
https://www.wowza.com/docs/how-to-use-rtmp-to-distribute-live-streams
Wowza Streaming Engine does not have logic to decide which live stream is “best”, however you can control stream targets using our REST API.
https://www.wowza.com/docs/stream-targets-query-examples-push-publishing