Which branch is better, IIT Kanpur statistics and data science (B.Sc) or IIT Dhanbad CSE?

Both the courses are good. 

However, with the advancement of technologies like AI and ML, and one’s increasing dependency upon them, Data Science has become a field with immense potential. 

Data Science has a lot of future scope, and its demand will only increase with time. This field requires a good understanding of Statistics, Mathematics, and Computer Science (Especially Python Language). 

BSc. in Data Science is an even better option than CSE at present. Moreover, college-wise, IIT Kanpur is way ahead of IIT Dhanbad. 

Therefore I would recommend you choose BSc. Statistics and Data Science at IIT Kanpur over CSE at IIT Dhanbad.