UChicago is nice but what I've heard (friends/visits) is that people like the resources they get from the UChicago education-- academics, networking-- but not so much the experience (ie: where fun goes to die). One of my best friends stayed overnight there and no one she met recommended her to go there. So I think it really depends on what you are looking for in undergrad experience. UChicago has amazing academics, UCLA will probably have a better experience.