Yes it's an important decision but not one you can't change your mind about later on.

My DD's current school, we had the "luxury" of asking about 4 days prior to the start of the school year, as we had just moved into the area and been allocated a house at that time. I interviewed each of the principals of the two nearest schools and based my decision on that. One of them said there was 'no bullying' in their school, the other one talked about the strategies and policies they have re bullying, I went with the school who admitted to it (every school has bullies) and have so far been really happy with them.

On the other hand I have a friend who researched years ahead and placed her DD in a school which was out of area, because it was supposed to be "the best" with an excellent reputation. Unfortunately for her, this means that an enormous percentage of unmanageable children have been dumped into this school, and they have had nothing but grief year after year. Her DD is very bright but is not getting the appropriate extension work as the teachers are worn too thin dealing with chn swearing, throwing and jumping on the furniture.

Personally, I think there is value in moving children if the school environment turns out to be one not best suited to them as an individual. So while it's an important decision, you can always change you mind later on.