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Updating regional sales data effectively on your dashboard is best achieved by ensuring that the data being represented is accurate and up-to-date. The correct method in this context is to update the data through the Power BI service. This approach ensures that any changes made to the underlying data sources are reflected on the dashboard automatically.

The Power BI service allows for scheduled refreshes and real-time data updates, meaning any modifications made in the data repository will show up on your dashboard without needing to manually intervene. Utilizing the capabilities of the service makes the process more efficient and reliable than manually editing or refreshing components of the dashboard.

The other methods mentioned, like editing dashboard tiles or relying on features from external applications, do not provide the same level of integration and automation offered by the Power BI service. These methods may lead to discrepancies or require more manual effort to ensure that the data shown is accurate in light of changes in the data source.