Which is better for a PGDM, IMT G or TAPMI?

IMT Ghaziabad is in a different league as of now. Though TAPMI is improving, It's still behind IMT G. In this scenario, the institute matters, not your specialization.

In my limited experience working in the sector and with recruiters, IMT has a better reputation than TAPMI. In many organizations, IMT is a better B-school than TAPMI. It's about image. As your career progresses, that is more significant than campus placements.

IMT is relaxed and requires self-motivation. You have every chance-use it. IMT has a great faculty, so you should be fine.

Undoubtedly, IMT G is a better option than TAPMI.