Did you not check out/do some research on both universities before applying? Obviously the university with the better course/degree is more important. You're not wasting £9k a year for socialising, you're wasting it to get a degree certificate and in this day and age you're better off going for whichever one will give you more of what you need to get somewhere post graduation. You can still have a social life wherever you go if you put some effort in.
Especialy during these times, go for the university that will put more effort into giving you some value for money.