In my opinion, I would choose a well established school. I know first hand thaT DBSJP is a gorgeous school, but it's a cubic zirconian. Teacher turnover rate is high. Most of them by the way are excellent, but do not get the support they need either. Students do not get the support they need. It's all smoke and mirrors.
Do yourself and your child a favor and go for a well established school with procedures already in place versus a new sparkly school with no resources and a medicinal feel. Good luck.