Hello Srikanth, 

If we generally compare these two colleges then IARE is far better then Guru Nank Institute. But the issue is that the flagship course of IARE is Aeronautical Engineering.

Whereas GuruNanak is also a decent college, it has got a 3.3 rating out of 5. So the decision is on you.

I will still advise you to opt for IARE as it hase great placement records. 

Hope this helps, Thank You 

All the best