UCSB and UCSD are the two schools I’ve narrowed down to, and personally, I’ve been leaning towards UCSD (Sixth college) because I know UCSB is more of a party school and that really isn’t my scene. Currently, a bio major but I may at some point switch to political science. Both are about the same distance from my home so that isn’t too big of a deal. Any advice/info on each school would be appreciated. 
Any cost differences?
Have you looked into the ease of changing majors at each of the schools?
Priority registration is a nice perk for UCSB Honors.
Any school can be a “party school” and each school will have non-party like minded students so this should not be a major factor in your decision.
Have you visited both schools? Any preference based on your visits?