Both are the decnt colleges in term of placement, Faculty, Industry Exposure etc. A number of well known domestic and multinational companies and NGOs in Cochin University of Science & Technology visit campus each year for placements. Starting with few companies, there are around 70 reputed companies which hold on-campus interviews for placements. You can also check the recruiters list 2017-18 with the given below link.

http://cpo.cusat.ac.in/images/recruiters-2017-18.pdf

BIT Sindri also welcomes the best recruiters in India and abroad to its campus. You can also check the complete placement of the college with the given below link.

https://bitsindri.ac.in/docs/tpo-2016-17.pdf

You can also check the genuine reivews of the colleges with the given below links.

https://www.careers360.com/colleges/bit-sindri-dhanbad/reviews

https://www.careers360.com/colleges/school-of-engineering-cochin-university-of-science-and-technology-ernakulam

Good Luck!