NIT Jaipur or MNIT is the best among the options you have mentioned. The reason it is ranked better than others is its location. Being a metro city, Jaipur is a very developed, safe, and well-connected city. It also boasts of good campus life. 

I have arranged the colleges in descending order based on the following criteria:

Placements:

So the order for placements is 

NIT Kurukshetra>NIT Jalandhar>NIT Jaipur>NIT Silchar 

Hostels:

NIT Silchar>(new buildings)NIT Jaipur>NIT Kurukshetra>NIT Jalandhar 

Facilities and opportunities:

NIT Jaipur >NIT Silchar >NIT Kurukshetra >NIT Jalandhar

For girls MNIT Jaipur is the best owing to its safe location.