Dear Krishna Priya,
As per me it is always good to join in OLD IIT's than the New IIT's bcoz OLD IIT's have very good brand name than the NEW IIT"s...But if you are really interest in branch then see which branhch you might be getting in OLD IIT and NEW IIT..then choose which IIT..if you want to go throgh branch wise then you have to prefer NEW IIT other wise wht ever the beanch i just wanna use the brand name of very reputed IIT then go for Madras..
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