What's the difference between Janus and Amazon Kinesis Video Streams

Hello !
I would like to know if there is a difference between Janus and Amazon Kinesis Video Streams ?
I already read this : https://docs.aws.amazon.com/kinesisvideostreams-webrtc-dg/latest/devguide/what-is-kvswebrtc.html but I’m still not sure to understand what is it and if i should use it.

Thanks for explanation!