When I was deciding I had a potential list of 4 schools. One I ruled out becasue it's reputation is just rubbish by everyone I've ever spoken to. Of the other 3, I put them in oder of preference, based on local knowledge, ofsted etc etc. One was a massive school, with an intake of 60 in recpetion. (this was my second choice) One was much smaller with an intake of about 22,(1st choice) and the other was our catchment school which didn't have a great reputation, but a head who's son has asd and who I felt would provide reasonable support for the sen kids. (3rd choice).
After that I went to meet the heads and sencos for each school. I quickly discounted choice 3 after visiting, mainly due to the set up of reception and year 1. All running around together in , not a huge space. Seemed quite manic and loud. Which left choice 1 and 2. I was really impressed with the heads and sencos at both schools and was leaning towards my 1st choice smaller school.
However, I then spoke to my son's portage worker, salt, OT etc as well as the local secondary that the primaries feed into. I asked them what their opinion was. All of them said school 2, without question. I also asked other local parents of sen kids and got the same response, so against my orginal feeling I went with my second choice (large school).
It has been fab, the school are brilliant and every issue I've had so far, has been dealt with promptly and efficently. If I'd gone on ofsted ratings and school league tables, I'd have gone with the smaller school, but I don't think it would have been as good as where we are. School tables and ofsted are hopeless, when it comes to finding a suitable school for a child with sen.
Out of interest if I was my daughter I was deciding for, she's have gone to the other smaller school. Some schools are better for some kids and others aren't. The trick is to find the right one!
If I were you, as a starting point, I would decide what schools might be options then ring and ask to go and speak to the head and the senco. When you meet the senco, take a list of questions you've thought of before (as you always forget things you want to know). Ask them if there are other parents with children with similar issues, you could talk to, and take if from there.
HTH