Which one is better, CSE at MNIT Jaipur or NIT Durgapur?

There are not many differences between the institutes. You can prefer MNIT, Jaipur only if the location is advantageous on your side. The difference, however, is not exactly a lot. 

Placements:

The average placement in Jaipur has been better for several years now. However, if you have the will to work, with relevant education, then the opportunities and offers provided by either of these institutes are the same. Various top companies recruit almost the same number of students from both of these institutes. 

For instance, in 2019, 11 students were recruited by Microsoft from NIT Durgapur with a package of 39 LPA each. 4 other students were recruited by Amazon with 20 LPA and above. There are several others too. 

Here is the placement reports of the year 2020 for both the institutes,

Thus, there are somewhat the same opportunities in both. Google and Facebook have also visited the campus to recruit students previously. DE SHAW, Samsung, R & D, Directi, Goldman Sachs are other top-tier companies that visit the campus timely. 

In the case of the brand name and as an overall institute, MNIT Jaipur is considered better than NIT Durgapur. 

MNIT is better in terms of infrastructure when compared to NIT Durgapur. Although, there are major upgrades and infra-development occurring in NIT Durgapur, yet it will still take about 3 to 5 years more.