Hey aspirant,
I can't suggest you about the branch with which you should go for as it totally depends upon your interest. As of course you can't waste your four years studying something in which you are not at all interested. So, you should go with the branch in which you feel the most comfortable.
Now, talking about both the colleges then I guess placement of both the BITS are quite same. The highest package offered at bits pilani is 1.4cr per annum and average is about 10-15lpa.whereas, in BITS GOA the average is offered around 6-10lpa.
Hope it helps.
Good luck.
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