Well, between Berkeley and USC:
- In terms of prestige, to the general public USC is probably as prestigious as Berkeley because (try not to laugh) of the SC football program -- everyone knows those Trojans. In academic and hiring circles, SC is impressive... but Berkeley wins that matchup.
- USC is pretty good academically, but Berkeley is great -- based on the faculty, the research, and the number of top-notch programs. In CS, Berkeley is the clear leader. For Econ you could go either way. Do keep in mind, for some perspective: both have enough resources to overwhelm the most ravenous undergraduate appetite for knowledge, so these comparisons -- while perhaps true -- might not reflect the level of education you will actually receive. In other words, both will teach you plenty regardless of whether you choose Econ, CS, or something else.
- Maybe more important academic considerations are the ease of getting into your desired major and then, once in it, the degree requirements. Also check class sizes during your general ed requirements (100-200 level classes) -- while most classes within your major will tend to be relatively small and will become smaller as you progress, Intro classes generally are large. If class size is important to you, try to find out how large those Intro classes typically are at each school.
- Don't underestimate the importance of dorm rooms, campus food, social vibe, logistics/transportation, and the availability of cool things to do -- you have to live there for (at least) four years, after all. Probably at least half of that time will be spent doing things not related to academics, so take a hard look at which place would make a better home.
Obviously if you come off the WL at Chicago and/or Brown, things may change. Keep contingencies in mind. But also prepare to be ready to make the choice between Berkeley and USC.
All four are obviously excellent schools presenting wonderful opportunities. If you pick the best fit for you and are willing to work, you’ll thrive.