A company is planning to implement a new feature in their Salesforce environment and needs to test it thoroughly before deploying it to production. They have access to three types of sandboxes: Developer, Partial Copy, and Full. The development team is considering which sandbox type would be most appropriate for their testing needs, taking into account the size of the data they need to work with and the complexity of the feature. Given that the feature requires testing with a realistic dataset that includes a significant amount of historical records and user interactions, which sandbox type should the team choose for optimal testing?