In terms of Placments
VJTI is Better than COEP
According, to careers 360 COEP has AAAA+ rating which means outstanding and VJTI has AAAA rating which means good.
(A : Lowest Rating || AAAAA : Highest Rating)
If we compare both the colleges in terms of placement then both are good colleges but if you have to choose one you can go for COEP.