Which is better VIT Chennai or PEC Chandigarh?

VIT is better as it has more than 200 companies coming for CSE students. If the student wants to go into a college with better placements or better exposure. 

The table shows a brief overview of the institution:

• The intake of students in VIT is not great as students above the rank of 2000 in VITEEE join some other colleges. 
• VIT has seats for merit up to only 6000 rank holders in CSE. Concluding only one thing that 80% of those 1300 VIT CSE students get through management quota. So, if the student is worthy then they will find themselves humiliated with children who come there through management quota.
• That's why even if the student gets a lower branch in PEC, take it as PEC is the legacy of notable alumni and will continue to remain. 
• Unless you have a certain inclination towards some branch then do opt for PEC the student will never regret it.

It is not possible to decide your inclination just after completing 12th as there is plenty of knowledge awaiting. When you take a branch that you probably didn’t realize in school also the placements in PEC are nice now it is on par with VIT. Overall, PEC is the potential choice.