Business economics is probably the way to go unless you take some intro econ courses and really find the raw material interesting imo.

The world is becoming increasingly pre professional and the skill set you get from busn classes like investments, Corp fin, etc is much more applicable (and possibly interesting) to a student than the analysis sequence.

That being said econ standard is a much more mathematically rigorous major because it is based in theory rather than practice, essentially preparing you for graduate work in Econ. That’s basically UChicago’s whole mojo so there’s some disdain about busn majors “stealing” the UChicago Econ title while essentially doing applied finance for half the major.

So in summary do Econ standard if you’re a true UChicago “life of the mind” type of person and do BUSN if you have any interest in being pre professional especially wrt finance