If you go by college name then mmmut is far better than jss as mmmut is a government college while jss noida is a private college at mmmut the highest package was about 19lakhs and average was about 5lakhs on the other hand jss noida placement percentage in cs and it branches is more than 80% and highest was 40 lakhs also you should note that jss has a local advantage as it is located in noida which is an industry hub but overall if you are getting mmmut I would advice not to leave it as there the competition is better also ece branch is also computer related branch so you can try for off campus placements as well.