This question can be seen in different aspects, such as
1. concepts contained in both streams.!
2. what are career aspects?
3. what will be the salary etc..?
4. growth in professional life..?
Let me tell you that,
- Information technology indicates towards, Installation, maintenance, support etc.whereas computer science indicates towards most of the programming and logical concepts to develop software. so, choose according to your interest..
2. In terms of career aspects, both are good to choose as career but again your passion and interest matters.