This part 3.1 of the series evaluates reverse ETL tools, focusing on the difference between bundled and dedicated tools. It emphasizes four key considerations for evaluating a reverse ETL vendor: data connector quality, sync robustness, observability, and security & regulatory compliance. The guide highlights the importance of choosing the right tool to drive personalization, growth, and operational analytics, while also acknowledging that there are challenges in selecting a suitable reverse ETL vendor. It provides an overview of the two lanes of reverse ETL tools: bundled and dedicated platforms. Dedicated reverse ETL tools are considered more specialized and better suited for most companies, offering high-quality connectors, robust syncs, observability, and security features. The guide encourages readers to consider data connector quality, including breadth and depth, as well as sync characteristics such as reliability, validation, incremental syncing, scheduling, triggering, and speed. It also emphasizes the importance of observability features like alerting, integration with monitoring tools, detailed logging, usage audit logs, and real-time debugging. The guide concludes by highlighting five security considerations: data ownership, progressive regulatory standards, data encryption, API connector security, and governance plans.