dd goes to an OK (not excellent, not amazing, but OK) state primary school. We could afford to go private.
Reasons for state:
I wanted to give the state option a good shot, because I was state educated, my mother was a state school teacher and I believe in the system.
I wanted dd to be in a mixed school, and the nearest mixed state schools are some distance away. I wanted to be able to walk to school, and for dd to be at a school within the local community. I have a younger ds, and I want him to be able to go to the same school as dd.
I didn't like the vibe of the walkable (girls only) private school. Was very formal, and not so raucous and play-centric. Also did not warm to the other parents at the look-see. And disagree with the idea of selection at 3.5 (she would have had to attend a 3 hour long assessment session).
Also, this private school has classes of 24 for reception and years 1 & 2, increasing later on. I felt that since dd's state class would be capped at 30 (and at her school they have 1 teacher and 2 classroom assistants), the difference in terms of more one to one was limited. It just felt rather like a production line.
I do know of a good mixed private school with smaller classes and a more relaxed vibe (my nephews go there). It isn't too far. If I feel that dd is not thriving, then that is an option. But I find that having the reserve option had perhaps helped me to see the positives in dd's school. I am relaxed because there is an alternative if things go wrong. But is pretty positive so far, so fingers crossed.