Symbiosis, but only the Pune branch. It has wider options in terms of course selection, more liberal class structure and a stronger alumni network.
Pune is a student hub, so the overall culture is really laid back and easy to enjoy. Symbi also has it's own hostels, where as Christ has limited facility, so if you're not from Bangalore, that would be an issue in terms of safety and comfort.

Placements are relatively similar, both colleges having a large batch size. Cost of living in both cities is around the same, but the set back of SLS is that the fee structure is quite expensive, almost twice the fees of Christ.

Suggestion:

Symbiosis Pune should be chosen.

now coming to symbiosis Pune VS BVP

It depends.

If you are applying for MBA then symbiosis is any day a better choice.

But if you are planning to do BTech. Or MBBS then BVP is the better option.

BBA LLB or BA LLB is equivalent in both the colleges.

FinAL SUGGESTION : CHOOSE THE COLLEGE ACCORDING TO YOUR REQUIREMENTS NOT OTHERS SUGGESTION.

Hope this helps.