My daughter is in year 9 and i'm very happy with the school. Every school will have different pros, cons, ethos, you have posted too about Bolingbroke i see, it would be hard to compare as the offering is so different from the first, single sex schooling v mixed sex schooling, class size, sports offering etc. To hep you decide i would start with what is the most important to you and more importantly for you daughter for her to prosper. For me it was important the class size as my daughter hugely benefits from this. But for many the number in class is not as crucial. I also wanted the wider curriculum til year 10 in languages.