BRFplus as decision framework for the SAP variant configuration
BRFplus and the SAP Decision Framework does provide extensive functionalities for calculations, decisions tables and procedures. BRF+ and the SAP Decision Framework are easier to use and do provide a user friendly maintanance frontend compared to the usual variant configuration.
The CaRD Add-on Rule Designer will be perfect when complex rules with different types and validities need to be maintained. BRF+ respectively the SAP decision framework is used to maintain multi-level configurations and calculations.
A common example would be to maintain the high-level sales configuration within the CaRD Rule designer and the inheritance of batteries or springs can be done and managed with BRF+/SAP decision framework.
Both tools meaning BRF+/SAP decsion framework and the CaRD Rule designer are complement tools which can be ideally combined to each other.