I got my name selected for welinkar PGDM ebiz benglore and chetna Mumbai PGDM marketing. Then for which college I should give prefer?

Yes even I said you that but you will realize at a certain point of time Brand name doesn't matter, only the work that you do matters, and since Welingkar is offering Ebiz which is a very narrow domain, there is not much you can learn. If you are really doubtful then consult some current students.