W/o getting into the details of why we need to do this (has to do with field types and a specific plugin)...
Every time a selection list field is edited, we want to write the value (string) to another field. So a simple, when edited, write the new value also to another field. At least 2 ways to do this seem via a Behavior (using ScriptRunner) or using a rule in "Automation for Jira" (newly included for "free" with Jira DC).
We were planning on using Automation, but is one better than the other? Performance? Chance or an editing getting "missed" (not sync'd)?
In case it matters, we are using Jira DC, 8.20.6
TIA,
Todd