I think it depends on where you're looking at. I'm from the US and did my undergrad there. Then moved to the UK and did post-grad here. The US is very campus based, so lots of activities going on and a a huge portion of students living on campus. I do think it comes down to the schools you are looking at though. My only experience of uni in the UK is London and as an adult, so I was off-campus and not as involved in student life. But I know loads of people in the US who continued onto post-grad there and still maintained a rather active student life either living on-campus in graduate housing or just off campus in apartment complexes mainly housing students. If you're interested in experiencing Frat / Sorority life, then the US is the way to go. Just remember that technically the legal drinking age is 21.