Workflow Field and Formula Fields Updates

Workflow Field Updates

1. Changes in Parent record cannot be updated in child records.
2. If the record was updated with workflow field updates, fires before and after triggers one more time. Custom validation rules, duplicate rules, and escalation rules are not run again.
3. It considers criteria before updating the field value.

Note: Workflow field update is recommended over formula field for better performance.

Formula Fields 

1. Change in Formula field cannot invoke trigger or workflows.

2. Changes in Parent record will be automatically reflected in child records.
3. Formula field values cannot be modified manually.