The Indian statistical institute at Kolkata, at Bangalore and at Delhi, are undisputedly the best for the subject.

It is really renowned for its Statistic (B.Stat + M.Stat), Math (B.Math, M.Math), Computer Science(M.Tech) courses. I pursued my M.Tech in Computer Science from there. It was a great time to spend at ISI. Professors are very helpful. They do encourage questions from students. Assignment works are challenging and you will definitely learn something from those as well. Central Library is good enough to support your study. Moreover there is a Dean’s library from where you can borrow books for a whole semester. Study pressure may be a bit higher than any other institute. It is a great place for learning.
If you are asking from a job perspective then, I feel campus recruitment in ISI is a bit weaker than IITs. But still people do get jobs in industry like Microsoft, Google, Synopsis etc. through campus recruitment. However, do not worry much about recruitment. I don’t know any student of ISI who is not doing well in his/her career.
Apart from ISI, I can tell you some universities that are good – Delhi University, Calcutta University, Hyderabad University, Pune University, Pondicherry University these are some typical examples.

All the best for your career!