Comment by dCrumpets

Definitely go to Oxford over UCSD. There’s a world of difference in difficulty to get into, and like the other person says, SD isn’t the biggest tech scene unless biotech is your focus. UC schools are also huge and impersonal, part of what lets them offer decently cheap tuition to in-state students; but if you’re not in-state, I don’t think you’re getting the best value for your money. My answer might change if the alternative were Berkeley.