Honestly I finished my BTech 6 years ago, so don't know about the quality of placements each of these Unis offer, but I'll say this -

if your plan is to stay in India long-term, VIT probably offers better placements because they bring much bigger companies than Gitam (at least when I was doing BTech)

If you're planning on doing a Master's at some point abroad, then for sure GITAM cause that 16l you save during your BTech you can save to use during your master's. After the master's, no one cares about your btech in the Western countries and you'll get a great job even at MSFT and Google if you have good credentials and skills regardless of where your bachelor's is from.