Hello Vaibhav, 

This is great that you have kept your option open for now, since no college has started their counseling yet. Now there are some factors which I would like to mention that hopefully will help you in your decision.

As you know that COMEDK is an exam which is conducted for colleges in Karnataka every year. The number of applicants in these exams are too high that seats get filled very fast. However, colleges under COMEDK can give you lot of opportunities after graduation. Since Banglore is also known as silicon valley of India. Most of the companies based there would very much likely to recruit freshers from the college present in Bangalore. So In this way, COMEDK has an upper hand. 

Some of the good colleges accepting COMEDK scores are given in the following link. Please go through it. Read the reviews of each college by students, it will help you to know more about the college education system and placements.

https://engineering.careers360.com/colleges/ranking/2016/top-engineering-colleges-in-India-accepting-comedk-uget-score

Now coming to Vellore Institute of Technology. This is one of the most reputed colleges in India and getting a seat here with the choice of branch is very much unlikely for many students. However, applicants do crack its entrance exam and take admission in this college. According to the reviews of alumnae of this college, the education system is very much conceptualized, which includes theoretical as well as practical knowledge. Workshops, Sports events, and national competition are happening throughout the year, Which is very beneficial for getting experience. They also send students on International Projects to give more exposure to the student which will help him in future. Placements are also quite decent. 

Hope you find this information useful. Have a great future ahead.

See it depends on you finally where you want to take admissions has an advantage of being silicon valley of India also if you are saying that you will get rank around 600 then you can get cse in Bangalore also in RV ,Ramaiah etc vit is also good its your call