The POST method allows a user to enter information in mulitple ways while the GET method retrieves predetermined inputs based off a users choice.
The GET method uses a href element in order to process the action while POST method uses a form and submit button.
GET method is better for showing a user all their options and having them choose one while POST method allows new inputs.
Based on what I said before a suggestion form would be better with POST method since new options can be entered and
The GET method is better for filtering to smaller answers like and Q&A form where youre looking for a section to read which may help you.