The first step is to determine if you are interested in electronics or computers. However, you also need to consider the chances of getting a job. The perk of picking electronics over computers is that you can learn the trending programming language and get a job easily which, ultimately, most of the computer science students will also end up getting the same.
VIT would be a far superior overall college than VIIT. Although VIIT students are also allowed to sit with VIT during placements some companies don’t allow them to sit for placements. Choosing CS will make it impossible to take up jobs that are in the core electronics domain.
Overall, I feel VIT Electronics is better than VIIT CS any day.