Between me and my 3 siblings and DH and his 3, we've pretty much covered every possible type of education available in the UK and both good and bad in each.
Totally agree that the best school is the school that is best for a particular child.
DD goes to an inner-London state primary. Un-leafy, predominantly social housing in the vicinity, almost 3/4 of the pupils are FSM and around 80% are EAL. School is Outstanding and rightly so - 100% L4 and nearly 70% L5 in English, and 20% got L6 maths year before last. Two amazing HTs in succession turned it round from the failing mess it was 10 years ago.
Given the levels of deprivation, it's the kind of school that MN would use as an example of the 'rough, dodgy council estate school' that everyone wants to avoid.
Well, with HTs and teachers who believe that children shouldn't have a label stuck on them from day 1, who managed to get hold of every bit of money and every opportunity available and who have huge aspirations for the children, you can have a school that is not only turning out polite, well-behaved children who enjoy learning and are achieving, but a school that also gives the local preps a run for their money when it comes to selective secondary schools (and staff who are prepared to talk to parents about their children trying for independent schools, scholarships and bursaries).
We're leaving London, but rather than sending DD to the 99% white MC school in the new town, she's staying at her current school.
Unfortunately the secondary schools in this part of the borough are dire academically (not even a small cohort succeeding) and the ones in the new town have a far from stellar reputation, so we are almost certainly aiming at a selective secondary and probably private as selective state is not really a viable option.
No-one can say that I want my DD away from 'the great unwashed' (as a pp so nicely put it). I do want her in a school that will allow her to succeed to the best of her abilities.
DH and I have both been school governors for primary and secondary schools in our area for over 12 years - long before we had DC. You don't always need parents to be the bright, interested and motivated governors.
One of the governors at DD's primary has a child at St Paul's Boys and a DD at Bute House. Four of the governors are Oxbridge educated - only 1 of those is a parent.