There is not much difference in both institutes and it does not make sense to leave a Tier II college in India just to join another one. If you are confident with your choice then you should go for it.
One of my friends studied at IMS Ghaziabad and he is now working in a respectable position in a top MNC.
IMS holds the record of 100% placement (International and domestic ). It is suggested you go for IMS, Ghaziabad as it is the best option in Delhi- NCR for a PGDM degree.