Which one to choose: IIM L PGP-SM course or NITIE PGDIM?

You should enroll in NITIE PGDIM because with an SCM background, you will benefit from learning core management. PGDIM at NITIE will focus on marketing, finance, and HR in a more comprehensive manner, giving you a boost due to your SCM background.

Check the following table for a comparative analysis of both programs:

As per the brochure for the IIML-SM course, you will be taught sustainability management, which focuses more on Macro and Microeconomics to sustain business environments. It will not cover core areas of Marketing, Finance, and HR. However, SM is an emerging field in management.