There can be a huge difference between one 'Outstanding' school and another 'Outstanding' school.
I saw 5 schools before filling in the application for DD last year. 4 were our nearest community schools and one was a school I had heard great things about despite the kind of demographic that would have most MC mothers running for the hills.
Four of the 5 were 'Outstanding' and the other was 'Needs Improvement'.
My choices ended up being the Outstanding school with the interesting demographic, then the Outstanding school that was the only school we had a realistic chance of getting a place at, and then the 'Needs Improvement'. The other two 'Outstandings' really didn't impress me at all and I only stuck them on there because I filled all the choices just in case.
So much of 'Outstanding' can be achieved by box ticking things that need not actually have any real effect on a child's education. And things that a school will lose points for may actually be a big positive. A lot of staff coming in/leaving will lose points, but perhaps the new staff are all fantastic and the old ones best retired to pasture...
Definitely visit as many as you can and ask lots of questions. For me a lot came down to who was doing the tour and how open they were to questions.
One school had us in and out in under 20 minutes, the person doing the tour was new and couldn't really answer questions.
Another spent 1.5 hours, the Deputy Head showed round, showed us examples of pupils work at different stages, let us listen in on music lessons, answered questions and actually offered up information on the support they had for all children - those with SEN, those who needed extending and those who were plum middle of the road.