Mt. Airy and Chestnut hill are definitely more suburban and overall very safe. They're also full of 'crunchier' parents from my personal experience.

You should go check it out to do due diligence, at least, as I think it'll be different from what you're thinking. I have a few friends who live around the Upsal station on the chesnut hill west line and they seem to be quite pleased. I tried linking you a google maps link, but automod deleted it. Check that area out on street view.