My first big investment property – feeling the pressure

Greater Noida – been eyeing Purvanchal Kailash Dham for a while now. My budget is around ₹2.5 Cr for a 3 BHK, and this project keeps coming up. I'm honestly nervous about under-construction projects, especially for an investment. What's the builder's delivery track record like? Any delays usually? My parents keep saying to go for ready-to-move, but the pricing here seems decent. I'm thinking long-term, maybe 5-7 years, so resale potential is crucial. Is there an active secondary market for Purvanchal projects in GN? Also, how does its price per sqft compare to similar projects nearby? Not sure if I'm getting a fair deal or if it's overvalued. What do you guys think? Should I pull the trigger here?