What turns you off about the UCSD environment? Many people (myself included) think that the campus is beautiful.
GPA matters more, but if you think a B student at Berkeley is an A student at UCSD, you’re in for a rude awakening; the difference in difficulty is not that dramatic.
There is a difference between ECE/EECS and CS/CSE. Do you want to be a hardware engineer or a software engineer? The degree you have determines that option.
UCSD has a solid ECE program that employers love and that has many local internship and research opportunities. However, doesn’t necessarily mean its program is better, nor does it mean that it’s better for you.
Definitely try to visit all the campuses! See which one you like best, because in the end, you only get one undergraduate experience.