I suppose the main difference was the pastoral care, and the other benefits stemmed from there.
ds 1 is not the most straightforward child - very young for the year, small physically, suffered from terrible eczema, but very very clever.
And while I said in my earlier post that had he been "more confident" the problems might not have arisen, that is not really true in some ways. He is a confident child, but quiet about it.
He was not accommodated well at state school. No fault of the teacher really, but she had 30 children in the class of widely varying abilities, a TA from time to time only, a couple of children who had very challenging behaviour, and a quiet clever child simply got ignored.
His current school has none of the behaviour problems, class sizes half that of his state school and a full time TA. In addition a lot of time is spent on pastoral care, for example, lunchtime at his previous school - into the dining hall, scoff your meal as quickly as possible, escape to playground where you may or may not be able to find your friends. Current school (applies up to Year 2, then gradually gets freer) - class lines up for main course, takes to table, eats with lunchtime assistant eating at each table with children, puddings brought round by dinner ladies, whole class leave together with lunchtime assistant. In my experience, lunchtimes can be really traumatic for Reception aged children, and his current school goes out of its way to make sure children feel as secure at lunch as they do during class time.
I think those are the type of things that make my dc comfortable; they really feel cared for and part of the school community.
On top of that are the curriculum differences and the extra-curricular opportunities. Yes, you can do all these things as clubs after school without having to pay through the nose for it, but it can be very hard work to organise if you have several dc. The national curriculum is seen as the starting point, the base line from where my dc's education starts.
I feel reasonably well-placed to comment. Not only has my dc spent more than a year at our local outstanding state school as well as his current independent one, but I teach primary. I'm teaching in the state system at the moment, but started my teaching career in the independent sector so have had the opportunity to see both sides, as a parent and a teacher.
Having said all that, we would not have moved ds1 had he been happy. Not until KS2 anyway, when we would have reconsidered. To me, KS1 is about settling into the routine of school, gaining the confidence and skills to get the best out of school, and, for us, becoming a true member of the local community. These ideals should be best served at the local state school, but, if the child is not happy, you're onto a loser.
Sorry for the waffle. I hope I've answered your question.