The honest bottom line
Every alternative shares one assumption: you are the engine. Salt is built on the opposite assumption.
If you want the work done while you are out
Every alternative above shares one assumption: you are the engine. You design the automation, send the chat message, work the CRM, write the prompt, or manage the assistant. The tools differ; the assumption does not.
Salt is built on the opposite assumption. The business state comes first, the thinking comes from Salt, and the work arrives finished, waiting for your quick okay. If you want a tool to use, any of the products above is a reasonable choice. If you want the work done while you are out, that is Salt.