Hey Nisha,
Considering all the aspects, after analyzing all the data related to these college.
I can say that MITE comes in top 5 engineering colleges in Mangalore. So for sure it's the best among the colleges you have mentioned.
And if we talk about Computer Science branch, then surely you should go for MITE.
Hereby I am providing you the links through which you can get detailed information regarding the placements of the colleges you mentioned.

https://www.mite.ac.in/placements/
http://www.aiet.org.in/training-placement.html
http://www.yenepoya.edu.in/admission-student-life-campus/placement-cell

I hope this will help you out, for further query you can comment below.
All the best.