Hello Vishavjit, 

There is no comparison between THAPSR CSE and UPES DEHRADUN petroleum. The recent world is running towards tge technology field and so is the demand for CSE branch is increasing. Now coming to the placement,

• 70% placement in petroleum in UPES. 
  
• 92% placement in CSE at Thapar

This is the first part, now lets compare the average salary and highest salary.

• UPES - 3 LPA AVERAGE, 12 LPA      HIGHEST.
• THAPAR - 9LPA AVERAGE, 30-32 LPA HIGHEST

The above mentioned salary are only for petroleum and CSE.

By now you know what is better. 

I hope you will find my answer helpful. 

All the best.