Which has better placements in CSE: Nirma University or LNMIIT?

Depends on where do you live
1)Nirma is heavily dominated by students of gujarat so you would miss out of a variety 0f people where as in LNMIIT you get students from quite some states of North which is better.
2)You get a hostel accommodation facility which is incredibly important for your self-growth ( you won’t recognise it now)
3) The faculty of LNMIIT is very good (PhD or PhD pursuing. Can’t say about Nirma)
4)The coding culture is very high and very good in LNMIIT
Overall my say would be to bank of LNMIIT if you wish to go for higher studies and plus the college has started investing in the CSE department