In my opinion, it will be the best if u go for SAP certification as this is the one most used worldwide by very large organizations; it provides the most accurate & flexible soulution to managing & integrating business operations.
So far SAP-HR is concerned, I would like to elucidate a few points that you must know before being a certified consultant:
1. Apart from being certified, having a primary implementation experience on any live project isequally important in SAP
2. You must be aware of the perosnnel processes that exist in India (or other countires where u want to migrate / intent to get a job), as this has directly to apprehend with the statutory liabilities / responsibilities.
3. SAP-HR is based on atleast 3 technical platforms: ABAP, Basis & WebDynPro. So first enquire with the insititute what is their pedagogy; whether or not they focus on these aspects.
In India, there are 2 premiere SAP (Germany) certified SAP-learning institutes: Genovate & Siemens. Their certifications are valid worldwide 7 fetch a good return on investment once you're on board.
Peoplesoft & Oracle have a drawback that they cannot be always useful for very complex businesses / processes & somethimes they violate the law of synergy / centralization / standardization. This is not the case with SAP. SAP Labs monitor the implementation & modifications made to SAP portals with each client; any unathorized access in inadvertently denied or sent for further routing / authorization.
SAP courses, today, typically range between 1.5 lacs to 3.75 lacs. There are other insititutes as well who offer SAP training but their certificates are not alwasy valid globally. In that case you have to solely rely on your implementation experience (which nevertheless will be the case otherwise).
I hope this information guides you. Good luck.