UCSD vs. UCSB- Theatre

I’m an incoming freshman, and I’m trying to decide whether or not I should go to UCSB or UCSD.

Right now, I’m currently accepted to these schools for a mathematics major. However, I love music and theatre. I’m wondering which colleges have the best opportunities for non-theatre or non-music majors in the arts. I’m even thinking about switching my major to theatre or music, so if anyone knows what it’s like transferring into a theatre major that would be wonderful to know!

Any info you have would be greatly appreciated!