At VIT Vellore closing rank is 15000 computer science engineering according to previous year and for VIT University, Chennai closing rank was 33000.
So there is high possibility that it may increase this year and you may come in the range of closing rank.
You should apply for VIT Chennai if you find it suitable. Else you can go for other colleges also.
There might be chances to increase in closing rank of VIT Vellore this year... So you should apply for counseling.
Hope it helped!