Mohali

I am from Chandigarh myself. But I must say TIME institute is the best for CAT preperation. or even Bullseye.
CAT is mainly about self study and dedication. But they will provide you the proper material to self study. Go for these two only.

You can refer this link for complete information: https://www.shiksha.com/design/fashion-design/exams/nift-entrance-exam

There are various rankings by different bodies, but true rankings state it amongst rank 50 onwards. Placement records and average salary is nominal and not so great as well.

CGC Mohali is a good option.

Dear Somil,
Both the institutes mentioned by you are equally good and thus it will be very difficult to tell which one will be the best option. However, we can help you with the parameters that you can keep in mind while choosing an institute among them. You can consider the below parameters :
1) Faculty,
2) Affiliation / Recognition
3) Course Material,
4) Quality Education,
5) Fees
6) Infrastructure
7) Success Rate.
8) Placement
9) Top recruiting companies.
Also, if possible go through the alumni speak section to get an idea what the alumni thinks about the institute.
Hope this information helps. Please feel free to revert.
All the best.