UCD (University Honors Program and $30k merit scholarship) vs. UCB

[lkg4answers]

I think you should contact UHP and ask if being in the program would help with enrolling in restricted courses such as CS. Tell them that you are weighing UC Davis against Berkeley.

UHP usually has an admitted student event. Are you able to attend that?

Edit: Davis offers CS in both Engineering and L&S.

The L&S CS website has information about how to declare CS as a 2nd major.

UC Davis also offers a minor in computer science. The UC Davis CS minor page says,

Several majors at UC Davis take classes within the Department of Computer Science, such as cognitive science, applied mathematics, applied physics, biotechnology and other majors in the College of Engineering. These are all viable options for students who want a career in the field of computer science.

[ucbalumnus]

You can use class schedules to get an idea of how full UCD ECS and UCB COMPSCI courses tend to be:

https://registrar-apps.ucdavis.edu/courses/search/index.cfm

https://classes.berkeley.edu/

[tamagotchi]

Berkeleytime also allows you to see the pattern of enrollment for a class over time: Berkeleytime

For example here’s an enrollment graph for CS 70 showing the class filling up long before the adjustment period.

[MYOS1634]

So, basically, would you be happy as a Math major at UCB, only being able to take 2 intro CS classes?
Math at UCB is going to be the best you can imagine. But you wouldn’t have a CS Minor.
UCD will have excellent math but it won’t be “the best”. Based on the above, you WILL be able to have a CS minor or a double major.