I tend to steer clear of US application threads because there are always posters who provide incorrect information on what is available to UK prospective students, and that anyone who considers has more money than sense. There is more on offer than one realises, but applicants are in the minority and it's an awful lot of extra work if applying to UK and US.
CityDweller sums up the options well, and both have merits, and so dependent on what the student wants to get out of their international experience. If the aim is for top tier colleges, the scholarship options are low (e.g. no sports, not to be confused with athlete recruit status), but Financial Aid can be high. If aspirations are not so limited to IL/high ranked, then there are a range of scholarship awards/aid available, some will extend to international students but you need to dig by college. International students can work on campus but not outside as part of visa rules, I think in Canada they can work off-campus.
It's not for everyone, and I hope from a practical (and selfish) perspective, my DD stays in UK for UG, but, she has a strong profile fit for US (actually wants to study on a dual BA 4 yr UG course that's 2 x Europe, 2 x US), so it would suit her.
We're a one income family, not wealthy by any means but if she were successful, would weigh up the pros and cons of a subsidised offer (if forthcoming) vs UK fees, to include what she'd get out of it beyond academic value alone, that is arguably often better in UK. But I think there is more to life than just studying, so happy to support her applications.