Best Practice for enhancing the SAP delivered standard WD ABAP application

Hi,

I am new to WebDypro ABAP.

To enhance the SAP delivered Standard WebDynpro Component (complex component with powl).

Kindly let me know the best practice for enhancing the Standard WD ABAP from the below 1 or 2.

1) To copy & create a "Z" of the component & make changes in that (or)

2) to enhance directly on the same standard component without making "Z".

Regards,

NS