IIT Gandhinagar - Indian Institute of Technology leads on NIRF ranking (#11). None of the compared parameters favour IIT Jammu - Indian Institute of Technology, though it may still suit your cutoff range or location preference. Check the cutoffs and your eligibility before deciding.
Based on placements, fees, NIRF ranking, return on fees and student ratings for the selected courses.
IIT Gandhinagar - Indian Institute of Technology and IIT Jammu - Indian Institute of Technology report similar packages (around ₹ 19.6 L), so placements alone shouldn't decide this.
IIT Jammu - Indian Institute of Technology and IIT Gandhinagar - Indian Institute of Technology cost about the same in total (around ₹ 17.8 L).
IIT Gandhinagar - Indian Institute of Technology is ranked higher by NIRF (#11 vs #56 for IIT Jammu - Indian Institute of Technology).
Comes out ahead on the most parameters in this comparison.
A good pick if its strengths match your priorities.