Which method is typically easier to use and involves less code?

Using HTTP Callouts is typically easier to implement and requires less code as compared to the other methods listed. HTTP Callouts allow developers to make HTTP requests to external services directly from Apex code, enabling them to receive responses in a straightforward manner. This simplicity is largely due to the nature of the HTTP protocol, which aligns well with the way web services are commonly consumed today.

In contrast, methods like SOAP web services usually involve more complexity, including defining WSDL (Web Services Description Language) files and dealing with more intricate data types and structures. FTP protocols require setting up file transfers that can be more cumbersome, often involving additional configuration and handling of file streams. Similarly, POP3 connections, which are primarily used for email retrieval, necessitate a deeper understanding of email protocols and handling.

Given the need for efficiency and reduced complexity when integrating systems, HTTP Callouts present a more streamlined approach, allowing developers to focus on the core functionality without the overhead of extensive coding and configuration that other methods may require.