CSE at older nits will carry the legacy but cse at new iits may not have the legacy right now but they will always have that brand and one's they are old enough they would beat even older nits thanks to the heavy funding received by the government. Brand name of an iit will always remain with you for life that would also give you an edge in placements and higher studies but at the moment you can choose older nits as well owing to fierce coding environment and the brand name and legacy they have made by now.