I've never deployed newrelic, but one of the nice things about netdata is the lack of dependencies and configuration knobs. From the web page:

"It collects more than 5000 metrics automatically, with zero configuration, it has zero dependencies, requires zero maintenance and comes with more than 100 alarms pre-configured to detect common failures, performance and availability issues."

With new relic you issue a single command to install an agent, or an extension, and configure your license key. Takes a few minutes and you don't need to spend expensive devops time configuring yet another "free" tool.

Newrelic is very expensive when you have hundreds of hosts (or hundreds of pods of you're running k8s)

I think, with my miserable knowledge of NewRelic, that NR is only for application monitoring. Not for system too, as this project.

New Relic absolutely does system monitoring. It's gonna cost you, however...

It's free.

"It's free". It costs sysadmins time to configure and maintain. Probably NewRelic costs less, depending on where the salary is paid.