I turned down UCL and KCL to go to Bristol, which is lower rated than both on this year's list.
I can see why you would want to go to a university as high up this list as possible, because you want your degree to be from an institution that potential employers will recognise. In the UK at least, having an Oxbridge degree will automatically doors to some opportunities that aren't otherwise easy to get into.
But, if you're actually concerned about the quality of education that you get (hint: if you're spending 3+ years on it then you probably should be), then bear in mind that individual faculties and departments within universities vary a lot and a ranking system can't replace doing your own research.
I can see why you would want to go to a university as high up this list as possible, because you want your degree to be from an institution that potential employers will recognise. In the UK at least, having an Oxbridge degree will automatically doors to some opportunities that aren't otherwise easy to get into.
But, if you're actually concerned about the quality of education that you get (hint: if you're spending 3+ years on it then you probably should be), then bear in mind that individual faculties and departments within universities vary a lot and a ranking system can't replace doing your own research.