Your major won’t be a joke at UCLA. In fact, business economics is primarily an economics major, which means you will be taking a decent bit of math, so you if you want a specifically business focused degree, you won’t get that at UCLA.
I know several people at UCLA to study “business” (really business economics) and then switching out because they don’t want to take economics courses that use partial derivatives. Be advised…
Berkeley is probably the better option because they have an actual BBA program IIRC