My Greater Noida investment hunt: Payment plan dilemma

After months of scouting properties in Greater Noida, I'm still debating the best payment approach. I work in real estate myself, so I know the super area vs carpet area games builders play, but buying for my own investment feels different. I'm looking at a 3BHK around Sector 122, maybe even a Parsvnath project, budgeting around ₹1.5 Cr. The market near Jewar Airport seems promising, but I'm trying to be smart. My main confusion is construction-linked vs. down payment plans. Builders are pushing CLP, promising future appreciation. But is paying a big chunk upfront smarter for an investor, trying to maximise my ROI? Or does CLP give more leverage if there are delays? I'm also worried about hidden charges that only appear towards possession. What's the real ground reality for payment plans here? Any insights on how much flexibility builders actually offer off the record?