Hi

Both the colleges are great and every year a lot of student gets graduated. Both are well reputed colleges. Before choosing lets look at some key features

NIT warangal: established in year 1959 this public/government college offers 45 courses. It has great placement, great faculty and infrastructure. An average salary package of 2021 given is about 13 LPA.  The highest package given in of 51.5 LPA. Top recruiting companies are dr. Reddys, amazon, intel,oracle, JP morgan chase & co. HP and more

IIIT lucknow: established in 2015 this is a public-private college offering 11 courses. The placements of this college is great ( a little more than NIT), great infrastructure and faculty members. Highest salary offered is 43 LPA and median salary is of 15 LPA. Top recruiters are amazon, google, linkedin, xebia, infoedge

So more or less both the colleges provide great placements, you can choose either of them. See which one you like the more and which one is more beneficial for you.

Hope this helps