UC automatically looks better as it is the more prestigious institution. From an employer perspective, most I've heard about will divide resumes into piles marked "CSU" and "UC" and hire from the UC pile first.
For pharmacy school...it might not make a difference since schools accept community college credits, so taking CSU classes vs. UC might not be a huge difference. A huge factor might be the ability for you to get a research position since UC is a research institution. CSU's cannot grant Ph.D's by law, so research is on the UC side of things.
If you want a degree in biology, UCSD, UCLA, and UCI are probably the schools with the best programs. HOWEVER....the difficulty of these programs mean your GPA won't be that high. As I said above, some out-of-state schools are ignorant of the difference and won't weigh a lower UC GPA with a higher CSU GPA.
Despite graduating from a UC, if pharmacy is your ultimate goal, go the easier route and go to CSU so you can have the higher GPA. You'll also save a ton of money in the process. I think the best CSU's are Sonoma State, CSU East Bay, and San Diego State University. They tend to be the most impacted.
Hope this helps!