Although I am in neither of the two colleges, I have some anectodes of my friends which will definitely help you.
One of my friends had got BITS Goa in fourth round of his counselling. Since the final round happens after reporting to campus, he went to BITS Goa and after 2-3 days in the final round his campus was upgraded to Pilani.
But some time later, he told me that he regretted coming to Pilani and wished he would have stayed in Goa. He told me that Goa’s vibes were much better.