Hi Prashant,

Bith VIT and NIRMA university are good. In terms of crowd vit is more crowded because it has 600-800 seats for every course. Also vit is more expensive than Nirma. But on ither hand there is attendence issue in Nirma university as it required 85% attendence and it also not have hostel facilities for students.

In terms of placement both are good colleges and provide good placement. 

Its totally on you that which college you have find attractive and in which one you will be more comfortable.  All the best. Make good choice.