How is Indian Law Institute Delhi for higher studies ? Is it better than DU or SAU when it comes to LLM & PhD ?

Bump. SAU vs ILI ?

Your PhD depends on your guide first and institution second. So see if you have someone in ILI whose interest matches with yours and try to find out how they are as a mentor. There are more institutional issues with SAU, lack of funding being the most prominent one. ILI doesn't have those issues.