The verdict
For a small team that wants a weekly view of pipeline, traffic and spend, I'd pick Databox. You connect the tools, choose the metrics and the report builds itself. The setup takes effort, so block time for the first build.
If your data has outgrown spreadsheets and app dashboards, and someone can write SQL, pick BigQuery. It gives you one place to land everything and ask any question across it. Watch the cost, because on-demand billing follows the bytes your queries scan.
They are not rivals. Larger teams often land data in BigQuery and report from a dashboard tool on top. If you only use one or two tools whose native dashboards answer your questions, you need neither yet.