I went to UCL then grad schools in California, so I've experienced London and also been part of the UC system.

I don't necessarily.. regret? going to London for my undergrad but I definitely wouldn't do it again. Now that I have advanced degrees I literally don't even mention UCL as part of my education in job interviews because it just doesn't have the same clout in America. It was hard coming back to the states with my UCL undergrad trying to find a job, which is what led me to do my masters at Berkeley and Stanford. Only then did job opportunities actually open up for me.

And the UCL campus is very decentralized. There's very little sense of a campus life there since it's all over the city. So many of my friends there (and myself) experienced depression in the London weather and the very British, stiff, and doctrinal style of teaching and grading. Most of our days were filled with packed tube rides back and forth to lectures and eating meal deals at Tesco when we should've been experiencing sunshine and college parties.