Should I choose UCs or CSUs?

If you are not a resident of California, then your daughter would be considered OOS if she is a US citizen. There is a unit limit amount for all students regardless of in-state/OOS/International, but the CSU’s charge a flat rate fee per unit, while the UC’s have the supplemental tuition costs which is not based on the # of units. Each school sets a maximum unit limit of each student and registering above the limit usually requires departmental approval. Full time is considered 12 units or more and part-time is less than 12 units.
Each CSU/UC will have varying costs for room/board/books/transportation which should be included into your budget.