Which is best erp certification in finance & accounts

ERP consultanting is not a field for the qualified CAs. You will have to compete with non-qualified people, without any  business, industrial or internal control knowledge. Any ERP is just an accounting and internal control system for a finance professional. Better try to find an opportunity with a good brand in industry or in consulting (i.e. CA firms). 

As advised by my friend CA. Bharat Hirde (when he was yet to qualify the CA Final), SAP consulting is not a good career choice for the qualified CAs, because you have to compete with non-CAs and nos. of implementation experience and SAP certifications bears more weightage than a professional degree and business processes / controls experience. 

But in the auditing and management field in corporates, professionals with business processes efficiency and controls expertise always dominates. 

Plese do also my old posts on this topic.