UCLA is a huge campus and is more prestigious. You’ll be up against a lot of competition because of the sheer number of its student body. That being said, it’s also located in a pretty amazing area (Getty Museum to the north, Santa Monica beach to the west, downtown L.A. to the east, and Manhattan Beach to the south). It has an active alumni.

As for graduate school, yes, it’s probably true that the UCLA name will impress more than a UCI. But, remember, grad schools are also looking at your GRE scores as well as other criterion such as internships/extra curricular activities, faculty recommendations, etc.

It’s a tough call but you can’t go wrong with any U.C. school. Good luck.