Which college you should go for ,should totally depend upon your personal choice. I can just tell you some comparable points about these two colleges , considering you want to pursue BBA LLB:
BBA LLB in Symbiosis Law School, Noida has lower fees
UPES is NAAC accreditated.
UPES is UGC approved while SLS is BCI approved only.
SLS , noida doesn't have a boys hostel.
The main difference that SLS is just a college but UPES is in itself a university.
For more information about these colleges , follow the given link :