Confused about Noida investment - need some guidance!

I'm looking to upgrade to a bigger 3BHK in Noida, mainly for the kids' school admission. My wife's priority is a safe neighbourhood. Been checking out ATS projects in Sector 10. Not sure if ready-to-move is better or under-construction offers better value. Kya kisi ko pata hai about ATS Infrastructure's construction quality lately? Heard some horror stories about delays. Also, is Sector 10 still a good area considering the prices? I'm torn between Sector 10 and maybe even considering Noida Extension, but honestly not sure which will give better ROI in the long run. Should I even be buying now, or wait? Thoda confused hoon, any advice?