Acst101 is for maths people.
Busl250 is for English people.
I struggled with acst because my maths isn't great, but k know people who say it was the easiest class they took. Busl250 was oneody best classes to date, but international students especially who didn't have great written or spoken English skills had a tough time.
Theyre very different subjects, but both have their own ups and downs.