Is pre-launch pricing actually a real discount in Greater Noida?

Budget sorted, loan pre-approved, but this pre-launch vs open-market pricing is seriously confusing me. Everyone glorifies 'early bird' offers for projects in Greater Noida, saying you get the best deal. I'm looking at a 3BHK in Sector 81, maybe around ₹1.2 Cr, and Spes Construction has a new launch rumored. My parents keep saying pre-launch is always cheaper, but I'm honestly not sure. Is it really a discount, or just a way to lock up capital for longer with construction-linked plans? I'm wondering if waiting for secondary market deals around ₹1.1-1.3Cr might give better ROI, especially with Jewar Airport pushing appreciation. Builders like Gaursons or ATS sometimes have spot discounts later, right? Change my mind if I'm wrong about pre-launch not being the best value.