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 :

https://www.careers360.com/compare-colleges?college=48389-3103-course=59633-6857-compareresult