Comparison of B schools is not encouraged in PG. Please refer PG rankings,consult seniors studying there and the college websites to make informed decisions on which college to join.
Regarding IIIT-A refer following threads
Couldn't find any threads for IIIT Gwalior
sumitkv2 Saysthnx mate!!!! but other than that!!!? placment wise?infra wise? any idea
Infrastructure details n faculty profiles can b viewed on their respective websites. N as far as placements r concerned, do visit the campus n ask the tpo of both the institutes as they do not care to update on their websites. I think u SHUD pay a visir to both of them before making ur final choice n also ask the students there.