If you consider best college in Computer Science and Engineering across the country than IIT is are the one of the best colleges across the country for Computer Science and Engineering then comes and NIT however not all the energies are good equally there are so many trees which are good suggest NIT Trichy, NIT Warangal NIT surathkal NIT Calicut, NIT Allahabad apart from them there are many private colleges which year level of IIT such as BITS Pilani, VIT, SRM so you can consider any one of them for Computer Science and Engineering.

Hope this helps all the best