Plenty of coders on top competitive coding platforms are students of NIT Jalandhar. This points towards a good coding culture at NITJ. Moreover, the fee at NITs is much less than PEC or Thapar University. 

Though the placement at PEC is good overall, it receives less offers from the core ECE companies. Thapar has its own list of top companies that prioritize it over other colleges. But I do not know much about their CSE department. 

Thus, I would recommend NIT Jalandhar CSE over the other two options. But if you want to choose between PEC ECE and Thapar CSE, I would recommend you make the selection based on your subject interest.