Exactly MillyR.
People make the best choice for each child, within the limitations of their circumstances at that particular time. We all bring our own personal history to it too. I went to a (not very good) comp, DH went to a (very good) comp and we both went on to good Universities, got good degrees, good careers. That probably makes me feel more confident in the state system than if I'd only experienced private. I get the feeling Quattro is wavering, but her 'comfort zone' is private, and I'm guessing she went to either private or highly selective school herself. With her history, I might feel the same as her.
Any school is always going to involve some element of compromise, because there is no perfect school.
If I were to create my perfect school....
It would be big enough to offer a broad range of subjects, but small enough to provide superb pastoral care. Class sizes... tricky one this as different children suit different things.. probably between 15/20 depending on subject.Having said that, my ds was in a class of 12 which he found limiting, but loves his classes of 24. The school would be located in acres of beautiful grounds (Xenia will agree on at least one point!) within a city so that there would be plenty of vibrant cultural opportunities on the doorstep. Buildings... have to be the best bits of each of my dd and ds's schools.... dd's has some glorious buildings (mainly the Head's study and public areas.. there are some grottsville mobile classrooms out the back!) .... ds's has superb labs and other facilities but all encased in deadly dull 70's exterior.
As for that most important resource, the teachers... well, I would cherry pick 3 of my dd's teachers who I rate as exceptional, throw in a number of my ds's inspirational teachers and persuade a few of my excellent teacher friends to work there. Anyone mediocre, boring, unable to cope with a challenge or looking for an easy ride would be out. Oh and I'd have to resurrect my probably long-dead A level English teacher, who awakened my love of literature and inspired me to study English for a first and higher degree... so maybe there's a lot of truth in that saying, 'All it takes is one good teacher....'