which college is best for engineering SRM or AMRITA in faculty, academics, infrastructure, hostels, placements point of view
Look those colleges comes under lower Tier 2 colleges. If you are getting SRM KTR & also CSE, IT & Software Engineering stream, then KTR is best. Otherwise comparing with SRM's other campuses, then their will be nothing difference between those two. Try to be in the top 20% students in your class, then you can grab a good placement above 6 Lacs.
Although is aspects of other things, Hostels will be very good but very strict. Infrastructure is great of SRM KTRA, faculty members are also good.