I was in a similar situation and chose USC (even over UCLA) but that’s because USC gave me 75k university grants and I don’t have to pay tuition, all universities are basically free.
In term of opportunities for business majors, It’s USC > Cal Poly > Davis/Irvine.
In terms of name recognition USC > Davis/Irvine > Cal Poly.
Don’t get fooled by the lack of National recognition of Cal poly, it’s a very low-profile, and yet, a very respected school regionally in California it’s underrated. According to Gradesport, Cal Poly students tend to outperform UCLA students in terms of salaries and job placements if you compare students from the same majors at both schools.
USC has the best business school (especially accounting) but it’s not much better than Cal poly, they are pretty close, for the best bang of your buck, go to Cal Poly, USC isn’t worth the price.
UC Davis has terrible economics major and my mentor, who majored in Econ there, regretted it. And my accounting professors were strongly against me going to UC Davis for business/accounting.
UC Irvine’s economics department is just as mediocre as UC Davis, and their Business school (Merage) is also not as good as USC LeventhL/Marshall nor Cal Poly.
USC should be thrown away because of their cost.
Accounting is a very non-competitive major, and you can work in accounting as long as you have the relevant coursework, your school doesn’t matter usually, most schools are good enough if they are big four target, but I don’t think UC Davis nor Irvine is as big of a target as Cal Poly.
But, even when I mention the pros of Cal poly, it isn’t all rainbow and sunshine, Cal poly has significantly less racial and economic diversity than UC Davis and UCI, Cal Poly has more WASP, upper-middle class kids. I have unfortunately heard of racial discrimination at this school, but just take it as a grain of salt.
Not sure about the party scene, but UCI is more studious.
UCDavis and Cal Poly are both isolated and in a more rural area, Davis is surrounded by cows and farms, and Cal Poly is near the beach. Irvine is more suburban, and has more Asians.