Is BITS Hyderabad better than VIT Vellore for CS?

Short answer: BITS Hyderabad.

Birla Institute of technology and science – Pilani, is a deemed university under which there are 3 institutions.

1. BITS PILANI
2. BITS GOA
3. BITS HYDERABAD

BITS in itself a brand and is a highly reputable university across the world.

Vellore Institute of technology has 4 institutions under its name.

1. VIT VELLORE
2. VIT CHENNAI
3. VIT BHOPAL
4. VIT AP