Help for school selection!!! CWRU/UCSD, major is biochemistry

I swing between these two colleges and can not make decision…
If I go to UCSD, I want to change my major to bio engineering, but I need to keep my GPA higher than 3.9…it seems too difficult. And as a public school, I am wondering all the basic courses taught by TA…
Biology in CWRU is good, but it is not as good as in UCSD. Also, I want to transfer or get my master degree in UCB or UCLA, is it easier if i already in UC system?
Could you give me some suggestion about these two school? I am almost crazy now…Thanks so much!!!

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