Use Notes for ongoing account or contact information and History for recorded changes.
The account and contact forms also contain a Notes field for profile information. The Notes tab supports ongoing entries. Choose the location that helps your team find the information without duplicating it across unrelated records.
Use History to inspect recorded activity and changes, subject to your access. It helps distinguish a current profile value from the sequence of actions that produced it.
A client note is not a sent email, a task assignment, or automatically a case update. Use the appropriate workflow when you intend to communicate or schedule follow-up, and do not assume all note fields have the same audience.