Based upon my research, GITM Gurgaon is better than Amity in terms of Faculty and Placements. Also, companies like Snapdeal, Airtel ,Microsoft , Ibm , Amazon , Wipro etc. have come for recruitment there.
However Amity is better in terms of Hostel Facilities. Infrastructure is classic for both the colleges.
Just see which college you get and which is more affordable to you in terms of cost of the course, commute, etc. All the best 🙂