When you are pursuing a Specialization you get specialized for a portion of the subject. This means that you will know more about Specialization subject more than non specialized students.

Now the good or bad is relative. If you feel interested in Data Science then go for it else go for CSE because if you aren't sure about specialization its better to get some time and  then decide what to do next.

If you think of it CSE data science can be more advantageous as you will get scope in CSE and Data Science sectors. This will increase your demand in industry. But that doesn't mean being only a CSE you won't get these opportunities. But for only CSE if you go for Data Science then you will get relatively low package as the company have to train more about Data Science.

I would recommend you only to take specialization if you like it, else you will get wasted while studying.

To know more about VIT visit the link below:

https://www.careers360.com/university/vellore-institute-of-technology-vellore

To know more about Data Science visit the link below:

https://www.careers360.com/careers/data-scientist

I hope my answer helps. All the very best for your future endeavors!