For our Predictive Analytics platform, we have used both Grafana and Kibana

Grafana based demo video: https://www.youtube.com/watch?v=tdTB2AcU4Sg
Kibana based reporting screenshot: https://imgur.com/vuVvZKN

Kibana has predictions and ML algorithms support, so if you need them, you may be better off with Kibana . The multi-variate analysis features it provide are very unique (not available in Grafana).

For everything else, definitely Grafana . Especially the number of supported data sources, and plugins clearly makes Grafana a winner (in just visualization and reporting sense). Creating your own plugin is also very easy. The top pros of Grafana (which it does better than Kibana ) are:

Creating and organizing visualization panels
Templating the panels on dashboards for repetetive tasks
Realtime monitoring, filtering of charts based on conditions and variables
Export / Import in JSON format (that allows you to version and save your dashboard as part of git)

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