Both the certification courses PMP and SSGB fall under the Operations domain yet are very different in reality. 

PMP: This course facilitates handling and delivering projects efficiently and quickly. If you are interested in Project Management, the best option is the Project Management Professional (PMP) certification which is affiliated with Project Management Institute, PMI, USA. It 

also provides PDUs.

SSBM: This course facilitates proper optimization of business processes, minimizing waste and time wastage. If you are interested in the Six Sigma Green Belt (SSGB), then Indian Statistical Institute (ISI) Kolkata is the best option available. Some even think ISI Pune is good yet I will recommend you to go for Kolkata itself.