There should not be any comparison between the two colleges since NMIMS has far better career prospects than Atlas Skilltech University and you should definitely choose NMIMS over Atlas unless you have a valid reason to go to Atlas University.
It’s a relatively new college, it started in 2021 only and doesn’t have any accreditation whatsoever. Although the concept of opening such a university that is supposed to be focused on new-age urban multidisciplinary activities is laudable the fee of 12-13 lacs for a BBA is somewhat not justified. NMIMS on the other hand is a well-established college and enjoys a rich legacy. The curriculum is also very rigorous and makes you future-ready.