Hello  Hanish!

Branch selection totally depends on your interest . Although it is clear that IIT Kanpur is old IIT and IIT Ropar is new IIT so IIT Kanpur has better facilities and opportunities than IIT Ropar.If you are interested in computer science (coding related things and mathematics) then you should go with Cse and if you  want to make career in the field of government jobs then you should go with mechanical engineering in IIT Kanpur.

Hope it answer your concerns.

Hello Hanish, 

             First of all congratulations on your success in Jee advance.

      Coming back to main topic, see this one such thing that no one can better guide you than you yourself. 

             It all depends on your choice, your interest and your knowledge in that particular field. 

If somehow I or anyone else prefer you a branch which may be cool bt  later  may be out of your interest, then it will surely create problems.

   Always follow your passion, ur interests. 

  Mechanical or  CSE  or any other course each one has its own importance in today's worls hence you may sit for a while concentrate and think wisely what is your interest and what you want to pursue in future endeavours.

 GOOD LUCK BUDDY