Hey there!!

Amrita puri campus is better than Bangalore(since BLR is still a developing campus), 
 
Infrastructure and faculty and also Alumni are good in amprita puri,  Even the good cultural mix of students you get in amrita puri gives an edge

Placements wise:On-Campus:ampritapuri , All major companies come to amritapuri campus and it's centralized placement. the number of companies taking CSE branch is very high and CSE students bag the highest package every year from companies like Amazon,Cisco,Intuit etc

Hope this helps

Good luck!!