The tools you are comparing are like apples and oranges. PPF is designed for output processing and other business logic within CRM. BRF or BRF+ is a generic rules framework for making business decisions via rules and then allowing a program to execute outcome on those decisions.
To answer your question, is yes you could use the PPF to do what you want, but the BRF+ is a generic framework that does rules process in ALL of SAP ABAP basedapplications and not just CRM.
Take care,
Stephen