Don't pick based on what friends may (or may not) be putting.
I am just about to do my 3rd (and final) application. With dc1, the primary school that she went to had a split secondary catchment / admission zone with a 3rd umbrella catchment school, so it was always going to be that she would be split from her friends. Out of the 7 schools in the area we looked at 4 - two were too far away and the last was the Catholic School. We then looked at the one in the next LEA.
Her order was: 1) Outside admission zone but favourite school. 2) Different LEA but a perfectly acceptable choice. 3) My banker as rather a school I hated on the doorstep (my admission zone school) then another one miles away. None of her friends went to her 1st choice school, but she has just left and it was absolutely the right choice.
DC2 - by then we had moved near to DC1's school, but he remained at the same primary school. We put admission zone school down as choice 1 and number 3 from last time. There was an absolute nightmare of admissions that year with nearly 100 children not getting any school place at all (this was eventually resolved). Of the children I know who didn't get a place none of them had put down a banker, obviously there still would have been issues but it was a very harsh lesson.
So now we come to dc3, new primary school. This is within the one catchment plus the umbrella catchment school, though there are a few outliers from outside the primary school catchment area which fall into another school. I think we will just put the one school, she doesn't want to visit any other school. Her sibling is still in the school and we can see the school entrance from her bedroom window. There isn't 294 children living closer than us.
I did some number looking today - for dc1 118 children outside the admission zone were offered a place, for this September that had dropped to 28. (So within 5 years)
For the majority what I did the first time round is generally the recommendation - visit as many as you can / want to and then slim it down to your choices. Only do what I am doing this time if you are absolutely certain of a place.
Good luck everyone.