<p>No, neither is more lenient than the other. </p>
<p>What do you want to study, btw? You have to specify it on the application, and different courses have different acceptance %s. It's not easy to switch subject once you arrive, because they admit limited numbers for each subject in each college. (E.g., at my college at Oxford, they admit a maximum of 4 students every year to study Chinese.)</p>
<p>Oxbridge don't like accepting students who studied under the US system for science degrees, because the level of knowledge they enter with is usually broader but lacking the depth of students from the UK system. You are more likely to be accepted for an arts degree, but there are exceptions to every rule. </p>
<p>Also, no offence to gchris07, but St Andrews in Scotland is popularly known for one thing only - Prince William graduated from there. It is known among UK students as a university for kids with rich daddies who didn't get into Oxbridge. If you want to go study in Scotland, the University of Edinburgh is the way to go. Fantastic university, fantastic city.</p>