I have done my 12th with 80% (CBSE) and my JEE rank is 35k. Which college is better for B.Tech CSE amongst CU and DU-IICT?

DU-IICT is a better choice. The placement is good in DU-IICT and the scope is higher too. CU is also a good college but in comparison with DU's faculty it doesn't have as good.

Both colleges are good in terms of everything faculty, facility, infrastructure and placement you can opt as per your interest and also, you can opt for your the nearest. But according to my point of view, you should opt of CU. There is everything there from entertainment, practical, facility, infra