Preferred communication technology

I would like to know which type of communication you use to let ABAP communicate with an external non ABAP program. I use RFC calls to an in SM59 defined registered server application. I don't use the SAP DCOM Connector because it has been set end-of-life. I also don't use SAP . NET Connector because we are not (jet) using the .net architecture. I also don't use IDocs, because I don't want to use a polling server.

Please tell me what you use and why you prefer that type.