Would you choose Spring Data JPA or Spring Data JDBC for a new project, and why?

The choice between Spring Data JPA and Spring Data JDBC depends on the project requirements and the complexity of the data model.

Spring Data JPA is suitable if:

• Support for complex relationships between entities is needed (OneToMany, ManyToMany, etc.).
• Caching, lazy loading, and automatic entity state management are required.
• Rich ORM functionality and ease of working with objects are desired.

Spring Data JDBC is better if:

• The data model is simple and flat, without complex relationships.
• High performance and transparency of SQL queries are important.
• Fewer abstractions and more explicit control over SQL are preferred.

For a new project, I would choose Spring Data JPA if complex business logic with many interconnected entities is expected. If the project is simple and speed of development with minimal overhead is important, then Spring Data JDBC would be preferable.