IIIT Delhi is a technological college whereas EAMCET exam is both for tecnical and medical colleges. Since you are talking about EAMCET exams, I am considering you are a resident of Andhra Pradesh or Telangana. If it is the cae then getting into IIIT Delhi will be very difficult as 85% of its seats are reserved for candidates of Delhi. Also, getting into a state level college is much easier than getting into a college of national level.

Since you asked for which one is better, then the answer is IIIT Delhi is better but takes admission thorugh JEE Mains, which is hard to clear. IIIT Delhi has got international exposure with experienced faculty and diverse background students. Some colleges in EAMCET colleges are good too but not as good as IIIT Delhi.