monitoring – Netdata, prometheus and grafana – why recommended in this constellation?

Currently I do setup monitoring-service for our Server.
I’ve found some articles, which recommend to use: Netdata, prometheus and grafana

So I wonder what are the benefits to use all three of them.
Can anybody explain it to me, why prometheus and grafana is recommended, if it’s seems that netdata do the same stuff as those both?

Even at the netdata-documentations, there are an article about the setup for this:

What are the benefits of this constellation?