Generate the Reverse API client from Hub or from an OpenAPI file?

We can generate the COBOL client from a Hub method or by uploading OpenAPI. Which one should we use for this process?

Use Hub when the Reverse method is already published: pick the method, set the client type and URL, and generate. Upload OpenAPI when the new service is the contract and Hub does not have that method yet. The upload creates a REVERSE project and then follows the same generation path. The OpenAPI file is limited in size. Compile the client into the program that has to call out.