Which is better: Zabbix or Grafana?

Zabbix and Grafana have different roles and are often used together rather than compared directly. Zabbix is an all-in-one server, network, and application monitoring solution that collects and analyzes data, with very robust alerting and event management capabilities out of the box. That would make it perfect for any organization seeking to have an all-in-one tool for monitoring and alerting across their infrastructure.

Grafana is a project that excels at creating customizable, interactive dashboards. While Grafana itself is not able to collect any monitoring data, it integrates with various data sources to visualize the metrics. In cases where you require a full-fledged monitoring solution, complete with alerting, then Zabbix will be a better choice; however, if your requirement is advanced visualization and dashboarding, then Grafana will be your tool of choice. Many companies use Zabbix for data acquisition and Grafana for advanced visualization.