Both the colleges are good in term of placements. If you want to prefer one you can go for St Joseph Engineering College, Mangalore.
You can also compare both the colleges from the given below link
http://www.engineering.careers360.com/sahyadri-college-engineering-and-management-mangalore/reviews
http://www.engineering.careers360.com/st-joseph-engineering-college-mangalore/reviews
Good Luck!!
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