Use both. "Execute OS command" task is the most powerful component in all ETLs. And every ETL-tool must have command-line utility to run it from scripts. We h

Use both. "Execute OS command" task is the most powerful component in all ETLs. And every ETL-tool must have command-line utility to run it from scripts. We have: a) ETL-packages that only coordinating a lot of small scripts b) And scripts that starts a lot of ETL-packages