You are designing a Go application that needs to serialize complex nested data structures. What serialization method would you choose and why?

When dealing with complex nested data structures in a Go application, Protocol Buffers (protobuf) would be a suitable choice. This is because protobuf allows you to define complex data structures using a schema, which can be more efficient and precise than JSON or XML. Protobuf schemas provide strong typing, which helps prevent errors in data structure, and the binary encoding results in smaller serialized data, reducing the overhead of deeply nested structures. JSON and XML are more human-readable but may lead to larger payloads and less precise data typing, making protobuf a better choice for complex nested data.