What is the difference between Recurrent Compliance Tasks & User Created Tasks?

There are two types of Compliance Task, one is the regular tasks automatically created from your Equipment and Duties on initial setup, such as your weekly fire alarm test.  The other is a User Created Task created by you as a reminder, such as 'fix emergency light in Sales Office'.  These User Created tasks can only be created for the Building Occupier although they can be shared to anybody or organisation via email.