It’s up to you to decide which college to go to. I can only throw some light on the advantages IIM Jammu has over other newly established IIMs including IIM Bodh Gaya

1. It was established in 2016 and initially was affiliated with IIM Lucknow but in 2019 it became an autonomous body.
2. It’s located in the center of Jammu in the vicinity of the airport, the railway station, and the bus stand and therefore offers excellent connectivity.
3. The students face a tight schedule and are well prepared for corporate life.
4. Great emphasis is placed on extracurricular activities.
5. The Annual Sports Event “Funathon” is held to showcase the talents of students in sports.
6. Guest lectures, HR Conclave, and CEO Summit make it possible for the students to have a one-to-one interaction with Industry experts.
7. Various clubs and committees are maintained by the students as well as the faculty.

These points are based on my friends' experience only. If you ask others I am sure you will see mixed responses. This is because both the IIMs are newly established and don’t have much difference.