Well you have COOIS & COOISPI (process industry). Then you have MD04/05/06/07. Then you have CO46, COMAC, MD09......and story continues.
The point is which report is beneficial and brings benefits to you as consultant and to the client. This could fluctuate from client to client. Again I would recommend to go through complete business scenarios per your project and figure out which reports they are using.
I hope this answers your question and always follow How to close a discussion and why
Regards
Rahul