Most of my clients with school aged children are very happy with the public schools that Collierville has to offer. Check out the trends for enrollment on any area that you are interested in - that will be your tell tale sign - what is considered a "sought after district".
Also, consider the source for your information. Schools are not being built where there isn't a need for them. Most parents migrate to the newest or best, so check out where the crowd is going in the area where you want to be.