All VIT campuses are great. But if you want to go for the one which have the maximum possibility available in terms of placements and offers then I would recommend you to go for VIT vellore over VIT chennai. See VIT velore have more alumni's working in top tech companies in India and abroad so the review of the placements effect on the packages. As well as the faculties are more research oriented in vellore and as you are going for MTech then you should explore the field of research and it will be a benefit for you.

To know more about VIT vellore visit the link below:

https://www.careers360.com/university/vellore-institute-of-technology-vellore

To know more about Software Engineering visit the link below:

https://www.careers360.com/careers/software-engineer

I hope this answer helps. All the very best for your future endeavors!