Update custom field when another field is edited, Automation Rule vs Scripted Field vs ?

[Alexander]

We have 4 custom fields which have to be updated if a certain system field is edited (Transition issue, Edit Issue);

I know that this can be done via Automation Rules and I just read that this can also be done by scripted fields (Scriptrunner);

which one is the better solution or is there another possibility?

[Andreas Knecht]

So with Automation you can setup a simple rule like this:

• Trigger: Field value changed (and select your system field)
• Edit issue action: And add your 4 custom fields 

This can be edited via the UI and will trigger for edit issue and transition issue.

I can't really comment on what's the better solution (between scripted field vs automation).  Scripted fields do probably allow for more power, but are probably somewhat harder to get going with. Automation is much easier to start with (simple point and click UI), but may not be able to support really advanced use-cases. Really depends on your comfort level with scripting and on your particular use case.