Both Looker and Power BI are designed to handle vast amounts of data, but their performance can vary based on specific scenarios. Looker, being browser-based and leveraging powerful databases behind the scenes, can handle massive datasets with finesse. Power BI, on the other hand, tightly integrates with Azure, Microsoft’s cloud service, which offers scalability options. The key is understanding your data load and growth projections to ensure whichever tool you choose can scale in sync with your needs.