Hello Ashish,

Both VMC and Narayana are premier IIT coaching institutes in India. The study material of VMC is better than Narayana but this does not matter to you. So as per coaching, I have friends in both VMC and Narayana and based on their experience I think VMC's teachers are better and more focused on JEE advanced and help the students with new problems. Also, the test series of VMC is more advanced than Narayana. There are many other institutes too like FIITJEE, Resonance, etc. you can try them too.

All the best.