Based on the specializations of both the institutes, they are leagues apart. The Tata Institute of Social Sciences (TISS) is solely meant for courses in social services whereas IMT Ghaziabad is a business school providing PGDM which is equivalent to MBA.
Going by your comparison, it is clear that your question is for HRM & LR at TISS which is an MA degree in Human Resource Management & Labour Relations. Although, it totally depends on your pool of interest that which course you want to go for, here are some comparisons to look for :
TISS is renowned for social services and it has clearly made its position among top colleges in the country.
At the end of the day, what matters the most is your interest and fervor for the subject. Unless you are very much inclined to the marketing and corporate industry, choose TISS which is economically friendly and also returns with a good placement package.