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 Business objects & 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