TBH....I really just went by how I felt in the school.
The 1st one we viewed (with the brilliant ofsted) was agood school but the teachers were very formal and to be quite honest the head teacher scared the pants of me. I felt like a 5 yr old again when I spoke to her (and I since made friends with a woman who said the excat same about her when she visited the school)
The 2nd school(the one they go to now) was soooo relaxed. The headteacher asked 2 year6'ers to show me around. I felt that was really nice touch, I got a really good feel of the place with them. Then when the tour had finished I spoke to the head teacher and he was the coolest dude I've ever encountered in any school. He had a creased up linen shirt and shorts on for a start!!