According, to careers 360 both the colleges have AAAA+ rating which means outstanding.

Ratings are based on Faculty, Placements, Cut-offs of national / state level Entrance exams, Accreditation and Reward status and Publication record from Elsevier’s indexing database - Scopus

You can choose any college according to your choice as both the colleges are good in placements.

In NIRF ranking VIT Vellore is in 16th position and Manipal is in 43th position.

Good Luck!!