research/shadowing experience, plus overall school rep and more supportive school resources.
G-Town would offer considerable better overall opportunities in this regard.
UCB has some great resources, but apple-to-apple, it will be much more 僧多粥少
UCB medical school admission percentage is around 50-55%.
National average (of all colleges) is 40%+.
Most ivy-plus schools have 80-90%+ medical school admission rate.
It is a no brainer.
Just in case your kid likes law or business instead of medicine later, G-town would offer advantage as well.